diff --git a/src/vs/workbench/services/configuration/common/jsonEditingService.ts b/src/vs/workbench/services/configuration/common/jsonEditingService.ts
index 31ca52ef0f0e5..13ce581ba64d2 100644
--- a/src/vs/workbench/services/configuration/common/jsonEditingService.ts
+++ b/src/vs/workbench/services/configuration/common/jsonEditingService.ts
@@ -51,7 +51,7 @@ export class JSONEditingService implements IJSONEditingService {
 		let hasEdits: boolean = false;
 		for (const value of values) {
 			const edit = this.getEdits(model, value)[0];
-			hasEdits = this.applyEditsToBuffer(edit, model);
+			hasEdits = !!edit && this.applyEditsToBuffer(edit, model);
 		}
 		if (hasEdits) {
 			return this.textFileService.save(model.uri);