diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index c9d3c977bca..552a75241de 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -1489,9 +1489,6 @@ declare module 'vscode' {
 		// optional kernel interrupt command
 		interruptHandler?: (notebook: NotebookDocument) => void
 
-		// // kernels (and _only_ they) can create executions
-		createNotebookCellExecutionTask(uri: Uri, index: number): NotebookCellExecutionTask;
-
 		// // kernels can establish IPC channels to (visible) notebook editors
 		// createNotebookCommunication(editor: vscode.NotebookEditor): vscode.NotebookCommunication;
 
diff --git a/src/vs/workbench/api/common/extHostNotebookKernels.ts b/src/vs/workbench/api/common/extHostNotebookKernels.ts
index a813bb816b9..a6fb60aab11 100644
--- a/src/vs/workbench/api/common/extHostNotebookKernels.ts
+++ b/src/vs/workbench/api/common/extHostNotebookKernels.ts
@@ -113,9 +113,6 @@ export class ExtHostNotebookKernels implements ExtHostNotebookKernelsShape {
 				data.supportsInterrupt = Boolean(value);
 				_update();
 			},
-			createNotebookCellExecutionTask(uri, index) {
-				return that._extHostNotebook.createNotebookCellExecution(uri, index, data.id)!;
-			},
 			dispose: () => {
 				isDisposed = true;
 				this._kernelData.delete(handle);
@@ -150,12 +147,15 @@ export class ExtHostNotebookKernels implements ExtHostNotebookKernelsShape {
 			const cells = document.notebookDocument.getCells(NotebookCellRange.to(range));
 			for (let cell of cells) {
 				const exec = this._extHostNotebook.createNotebookCellExecution(document.uri, cell.index, obj.id);
-				// todo@jrieken there should always be an exec-object
 				if (exec) {
 					execs.push(exec);
+				} else {
+					// todo@jrieken there should always be an exec-object
+					console.warn('could NOT create notebook cell execution task for: ' + cell.document.uri);
 				}
 			}
 		}
+
 		try {
 			obj.executeHandler(execs);
 		} catch (err) {