diff --git a/packages/angular/cli/commands/config-impl.ts b/packages/angular/cli/commands/config-impl.ts
index db26faf30f..37b1156219 100644
--- a/packages/angular/cli/commands/config-impl.ts
+++ b/packages/angular/cli/commands/config-impl.ts
@@ -223,6 +223,8 @@ export class ConfigCommand extends Command<ConfigCommandSchema> {
     } else {
       this.logger.info(value.toString());
     }
+
+    return 0;
   }
 
   private set(options: ConfigCommandSchema) {
@@ -264,6 +266,8 @@ export class ConfigCommand extends Command<ConfigCommandSchema> {
 
     const output = JSON.stringify(configValue, null, 2);
     writeFileSync(configPath, output);
+
+    return 0;
   }
 
 }
diff --git a/packages/angular/cli/models/command-runner.ts b/packages/angular/cli/models/command-runner.ts
index f6f2042c4c..209ed1be62 100644
--- a/packages/angular/cli/models/command-runner.ts
+++ b/packages/angular/cli/models/command-runner.ts
@@ -77,6 +77,8 @@ export async function runCommand(
       const content = readFileSync(join(__dirname, '..', uri.substr('ng-cli://'.length)), 'utf-8');
 
       return of(JSON.parse(content));
+    } else {
+      return null;
     }
   });