diff --git a/spring-cloud-dataflow-server-core/src/main/java/org/springframework/cloud/dataflow/server/config/DataFlowControllerAutoConfiguration.java b/spring-cloud-dataflow-server-core/src/main/java/org/springframework/cloud/dataflow/server/config/DataFlowControllerAutoConfiguration.java
index 122f69ca91..57284eadca 100644
--- a/spring-cloud-dataflow-server-core/src/main/java/org/springframework/cloud/dataflow/server/config/DataFlowControllerAutoConfiguration.java
+++ b/spring-cloud-dataflow-server-core/src/main/java/org/springframework/cloud/dataflow/server/config/DataFlowControllerAutoConfiguration.java
@@ -300,8 +300,8 @@ public TaskExecutionController taskExecutionController(
 		}
 
 		@Bean
-		public TaskExecutionThinController taskExecutionThinController(AggregateTaskExplorer aggregateTaskExplorer, TaskJobService taskJobService) {
-			return new TaskExecutionThinController(aggregateTaskExplorer, taskJobService);
+		public TaskExecutionThinController taskExecutionThinController(AggregateTaskExplorer aggregateTaskExplorer, TaskDefinitionRepository taskDefinitionRepository, TaskJobService taskJobService) {
+			return new TaskExecutionThinController(aggregateTaskExplorer, taskDefinitionRepository, taskJobService);
 		}
 
 		@Bean
diff --git a/spring-cloud-dataflow-server-core/src/main/java/org/springframework/cloud/dataflow/server/controller/TaskExecutionThinController.java b/spring-cloud-dataflow-server-core/src/main/java/org/springframework/cloud/dataflow/server/controller/TaskExecutionThinController.java
index 210911b3c3..da44e34c76 100644
--- a/spring-cloud-dataflow-server-core/src/main/java/org/springframework/cloud/dataflow/server/controller/TaskExecutionThinController.java
+++ b/spring-cloud-dataflow-server-core/src/main/java/org/springframework/cloud/dataflow/server/controller/TaskExecutionThinController.java
@@ -18,6 +18,8 @@
 import org.springframework.cloud.dataflow.aggregate.task.AggregateTaskExplorer;
 import org.springframework.cloud.dataflow.rest.resource.TaskExecutionThinResource;
 import org.springframework.cloud.dataflow.schema.AggregateTaskExecution;
+import org.springframework.cloud.dataflow.server.repository.NoSuchTaskDefinitionException;
+import org.springframework.cloud.dataflow.server.repository.TaskDefinitionRepository;
 import org.springframework.cloud.dataflow.server.service.TaskJobService;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
@@ -46,13 +48,15 @@
 public class TaskExecutionThinController {
 
 	private final AggregateTaskExplorer explorer;
+	private final TaskDefinitionRepository taskDefinitionRepository;
 	private final TaskExecutionThinResourceAssembler resourceAssembler;
 
 	private final TaskJobService taskJobService;
 
-	public TaskExecutionThinController(AggregateTaskExplorer explorer, TaskJobService taskJobService) {
+	public TaskExecutionThinController(AggregateTaskExplorer explorer, TaskDefinitionRepository taskDefinitionRepository, TaskJobService taskJobService) {
 		this.explorer = explorer;
-		this.taskJobService = taskJobService;
+        this.taskDefinitionRepository = taskDefinitionRepository;
+        this.taskJobService = taskJobService;
 		this.resourceAssembler = new TaskExecutionThinResourceAssembler();
 	}
 
@@ -68,6 +72,10 @@ public PagedModel<TaskExecutionThinResource> listTasks(Pageable pageable, PagedR
 	@ResponseStatus(HttpStatus.OK)
 	public PagedModel<TaskExecutionThinResource> retrieveTasksByName(@RequestParam("name") String taskName,
 			Pageable pageable, PagedResourcesAssembler<AggregateTaskExecution> pagedAssembler) {
+		long tasks = this.taskDefinitionRepository.countByTaskName(taskName);
+		if(tasks == 0) {
+			throw new NoSuchTaskDefinitionException(taskName);
+		}
 		Page<AggregateTaskExecution> page = this.explorer.findTaskExecutionsByName(taskName, pageable);
 		taskJobService.populateComposeTaskRunnerStatus(page.getContent());
 		return pagedAssembler.toModel(page, resourceAssembler);
diff --git a/spring-cloud-dataflow-server-core/src/main/java/org/springframework/cloud/dataflow/server/repository/TaskDefinitionRepository.java b/spring-cloud-dataflow-server-core/src/main/java/org/springframework/cloud/dataflow/server/repository/TaskDefinitionRepository.java
index eb7464fae6..d67268bef5 100644
--- a/spring-cloud-dataflow-server-core/src/main/java/org/springframework/cloud/dataflow/server/repository/TaskDefinitionRepository.java
+++ b/spring-cloud-dataflow-server-core/src/main/java/org/springframework/cloud/dataflow/server/repository/TaskDefinitionRepository.java
@@ -46,4 +46,5 @@ public interface TaskDefinitionRepository extends KeyValueRepository<TaskDefinit
 	 */
 	TaskDefinition findByTaskName(String name);
 
+	long countByTaskName(String taskName);
 }
diff --git a/spring-cloud-dataflow-server-core/src/test/java/org/springframework/cloud/dataflow/server/configuration/JobDependencies.java b/spring-cloud-dataflow-server-core/src/test/java/org/springframework/cloud/dataflow/server/configuration/JobDependencies.java
index 1ea7a4f909..14ff2b6b5b 100644
--- a/spring-cloud-dataflow-server-core/src/test/java/org/springframework/cloud/dataflow/server/configuration/JobDependencies.java
+++ b/spring-cloud-dataflow-server-core/src/test/java/org/springframework/cloud/dataflow/server/configuration/JobDependencies.java
@@ -244,8 +244,8 @@ public TaskExecutionController taskExecutionController(
 	}
 
 	@Bean
-	public TaskExecutionThinController taskExecutionThinController(AggregateTaskExplorer aggregateTaskExplorer, TaskJobService taskJobService) {
-		return new TaskExecutionThinController(aggregateTaskExplorer, taskJobService);
+	public TaskExecutionThinController taskExecutionThinController(AggregateTaskExplorer aggregateTaskExplorer, TaskDefinitionRepository taskDefinitionRepository, TaskJobService taskJobService) {
+		return new TaskExecutionThinController(aggregateTaskExplorer, taskDefinitionRepository, taskJobService);
 	}
 
 	@Bean
diff --git a/spring-cloud-dataflow-server-core/src/test/java/org/springframework/cloud/dataflow/server/configuration/TestDependencies.java b/spring-cloud-dataflow-server-core/src/test/java/org/springframework/cloud/dataflow/server/configuration/TestDependencies.java
index 71367fe520..53da12e280 100644
--- a/spring-cloud-dataflow-server-core/src/test/java/org/springframework/cloud/dataflow/server/configuration/TestDependencies.java
+++ b/spring-cloud-dataflow-server-core/src/test/java/org/springframework/cloud/dataflow/server/configuration/TestDependencies.java
@@ -550,8 +550,8 @@ public TaskExecutionController taskExecutionController(
 		);
 	}
 	@Bean
-	public TaskExecutionThinController taskExecutionThinController(AggregateTaskExplorer explorer, TaskJobService taskJobService) {
-		return new TaskExecutionThinController(explorer, taskJobService);
+	public TaskExecutionThinController taskExecutionThinController(AggregateTaskExplorer explorer, TaskDefinitionRepository taskDefinitionRepository, TaskJobService taskJobService) {
+		return new TaskExecutionThinController(explorer, taskDefinitionRepository, taskJobService);
 	}
 
 	@Bean
diff --git a/spring-cloud-dataflow-server-core/src/test/java/org/springframework/cloud/dataflow/server/controller/TaskExecutionControllerTests.java b/spring-cloud-dataflow-server-core/src/test/java/org/springframework/cloud/dataflow/server/controller/TaskExecutionControllerTests.java
index 686d6d06f9..8322c78307 100644
--- a/spring-cloud-dataflow-server-core/src/test/java/org/springframework/cloud/dataflow/server/controller/TaskExecutionControllerTests.java
+++ b/spring-cloud-dataflow-server-core/src/test/java/org/springframework/cloud/dataflow/server/controller/TaskExecutionControllerTests.java
@@ -224,6 +224,7 @@ public void setupMockMVC() {
 			SAMPLE_CLEANSED_ARGUMENT_LIST.add("spring.datasource.password=******");
 
 			taskDefinitionRepository.save(new TaskDefinition(TASK_NAME_ORIG, "demo"));
+			taskDefinitionRepository.save(new TaskDefinition("nope", "demo"));
 			SchemaVersionTarget schemaVersionTarget = aggregateExecutionSupport.findSchemaVersionTarget(TASK_NAME_ORIG, taskDefinitionReader);
 			TaskExecutionDao dao = daoContainer.get(schemaVersionTarget.getName());
 			TaskExecution taskExecution1 =
@@ -383,6 +384,10 @@ void getThinExecutionsByTaskName() throws Exception {
 				.andExpect(jsonPath("$._embedded.taskExecutionThinResourceList[*].parentExecutionId", containsInAnyOrder(null, 1)))
 				.andExpect(jsonPath("$._embedded.taskExecutionThinResourceList[*].taskExecutionStatus", containsInAnyOrder("RUNNING", "RUNNING")))
 				.andExpect(jsonPath("$._embedded.taskExecutionThinResourceList", hasSize(2)));
+		mockMvc.perform(get("/tasks/thinexecutions").queryParam("name", "nope").accept(MediaType.APPLICATION_JSON))
+				.andExpect(jsonPath("$.page.totalElements", is(0)));
+		mockMvc.perform(get("/tasks/thinexecutions").queryParam("name", "none").accept(MediaType.APPLICATION_JSON))
+				.andExpect(status().isNotFound());
 	}
 
 	@Test
diff --git a/src/scripts/build-docs.sh b/src/scripts/build-docs.sh
index 36d5e17d55..553a0287c3 100755
--- a/src/scripts/build-docs.sh
+++ b/src/scripts/build-docs.sh
@@ -4,7 +4,7 @@ if [ -z "$BASH_VERSION" ]; then
     exit 1
 fi
 SCDIR=$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")
-SCDIR=$(realpath $SCDIR)
-pushd "$SCDIR/../.." > /dev/null || exit
+SCDIR=$(realpath "$SCDIR/../..")
+pushd "$SCDIR" || exit
     ./mvnw install -DskipTests -am -pl :spring-cloud-dataflow-classic-docs,:spring-cloud-dataflow-docs,:spring-cloud-skipper-server-core,:spring-cloud-skipper-docs -Pfull,docs
 popd > /dev/null || exit