diff --git a/src/harness/harness.ts b/src/harness/harness.ts
index caafe629f30..e9de693e60d 100644
--- a/src/harness/harness.ts
+++ b/src/harness/harness.ts
@@ -1678,15 +1678,9 @@ namespace Harness {
 
             const actual = generateContent();
 
-            if (actual === undefined) {
-                throw new Error("The generated content was \"undefined\". Return \"null\" if no baselining is required.\"");
-            }
-
             // Store the content in the 'local' folder so we
             // can accept it later (manually)
-            /* tslint:disable:no-null-keyword */
-            if (actual !== null) {
-            /* tslint:enable:no-null-keyword */
+            if (actual !== undefined) {
                 IO.writeFile(actualFileName, actual);
             }
 
@@ -1744,8 +1738,10 @@ namespace Harness {
                 else {
                     actual = generateActual(actualFileName, generateContent);
 
-                    const comparison = compareToBaseline(actual, relativeFileName, opts);
-                    writeComparison(comparison.expected, comparison.actual, relativeFileName, actualFileName, descriptionForDescribe);
+                    if (actual) {
+                        const comparison = compareToBaseline(actual, relativeFileName, opts);
+                        writeComparison(comparison.expected, comparison.actual, relativeFileName, actualFileName, descriptionForDescribe);
+                    }
                 }
             }
             catch (e) {