ZapMyR
diff --git a/‎dist/exceptionless.js
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diff --git a/‎dist/exceptionless.js.map
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diff --git a/‎dist/exceptionless.min.js
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diff --git a/‎dist/exceptionless.min.js.map
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diff --git a/‎dist/exceptionless.node.js
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diff --git a/‎dist/exceptionless.node.js.map
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diff --git a/‎src/ExceptionlessClient-spec.ts
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diff --git a/‎src/ExceptionlessClient.ts
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@@ -25,4 +25,13 @@ describe('ExceptionlessClient', () => {
       done();
     });
   }, 5000);
+
+  it('should accept null sourceOrMessage', () => {
+    var client = new ExceptionlessClient('LhhP1C9gijpSKCslHHCvwdSIz298twx271n1l6xw', 'http://localhost:50000');
+    var builder = client.createLog(null, 'Unit Test message', 'Trace');
+
+    expect(builder.target.source).toBeUndefined();
+    expect(builder.target.message).toBe('Unit Test message');
+    expect(builder.target.data['@level']).toBe('Trace');
+  });
 });
@@ -59,14 +59,14 @@ export class ExceptionlessClient {
   public createLog(sourceOrMessage:string, message?:string, level?:string): EventBuilder {
     var builder = this.createEvent().setType('log');
 
-    if (sourceOrMessage && message && level) {
+    if (message && level) {
       builder = builder.setSource(sourceOrMessage).setMessage(message).setProperty('@level', level);
-    } else if (sourceOrMessage && message) {
+    } else if (message) {
       builder = builder.setSource(sourceOrMessage).setMessage(message);
     } else {
       // TODO: Look into using https://www.stevefenton.co.uk/Content/Blog/Date/201304/Blog/Obtaining-A-Class-Name-At-Runtime-In-TypeScript/
-      var source = (<any>(arguments.callee.caller)).name;
-      builder = builder.setSource(source).setMessage(sourceOrMessage);
+      var caller = (<any>(arguments.callee.caller));
+      builder = builder.setSource(caller && caller.name).setMessage(sourceOrMessage);
     }
 
     return builder;