diff --git a/web/src/test/manual/web/sentry-integration/errorhdr.js b/web/src/test/manual/web/sentry-integration/errorhdr.js
index b784f6a476..8cab6d4da7 100644
--- a/web/src/test/manual/web/sentry-integration/errorhdr.js
+++ b/web/src/test/manual/web/sentry-integration/errorhdr.js
@@ -4,39 +4,49 @@
     This script is designed to test KeymanWeb error message handling.
 */
 
-  function loadKeyboards() 
-  { 
-    var kmw=keyman;
+function loadKeyboards() { 
+  var kmw=keyman;
+  
+  // We start by adding a keyboard correctly.  It's best to include a 'control' in our experiment.
+  kmw.addKeyboards({id:'us',name:'English',languages:{id:'en',name:'English'},
+    filename:'../us-1.0.js'});
     
-    // We start by adding a keyboard correctly.  It's best to include a 'control' in our experiment.
-    kmw.addKeyboards({id:'us',name:'English',languages:{id:'en',name:'English'},
-      filename:'../us-1.0.js'});
-      
-    // Insert a keyboard that cannot be found.
-    kmw.addKeyboards({id:'lao_2008_basic',name:'wrong-filename',
-      languages:{
-        id:'lo',name:'debugging',region:'Asia',
-        font:{family:'LaoWeb',source:['../font/saysettha_web.ttf','../font/saysettha_web.woff','../font/saysettha_web.eot']}
-        },
-      filename:'./missing_file.js' // Intentional error - the file doesn't exist, so the <script> tag will raise an error event.
-      });   
-	  
-	// Insert a keyboard that will generate a timing error.  
-    kmw.addKeyboards({id:'unparsable',name:'non-parsable',
-      languages:{
-        id:'lo',name:'debugging',region:'Asia',
-        font:{family:'LaoWeb',source:['../font/saysettha_web.ttf','../font/saysettha_web.woff','../font/saysettha_web.eot']}
-        },
-      filename:'./unparsable.js' // Intentional error - the file has no parsable keyboard, so while the <script> tag will load,
-        // registration will fail.
-      });
+  // Insert a keyboard that cannot be found.
+  kmw.addKeyboards({id:'lao_2008_basic',name:'wrong-filename',
+    languages:{
+      id:'lo',name:'debugging',region:'Asia',
+      font:{family:'LaoWeb',source:['../font/saysettha_web.ttf','../font/saysettha_web.woff','../font/saysettha_web.eot']}
+      },
+    filename:'./missing_file.js' // Intentional error - the file doesn't exist, so the <script> tag will raise an error event.
+    });   
+  
+// Insert a keyboard that will generate a timing error.  
+  kmw.addKeyboards({id:'unparsable',name:'non-parsable',
+    languages:{
+      id:'lo',name:'debugging',region:'Asia',
+      font:{family:'LaoWeb',source:['../font/saysettha_web.ttf','../font/saysettha_web.woff','../font/saysettha_web.eot']}
+      },
+    filename:'./unparsable.js' // Intentional error - the file has no parsable keyboard, so while the <script> tag will load,
+      // registration will fail.
+    });
 
-	// Insert a keyboard that will generate a timing error.  
-    kmw.addKeyboards({id:'timeout',name:'timeout',
-      languages:{
-        id:'lo',name:'debugging',region:'Asia',
-        font:{family:'LaoWeb',source:['../font/saysettha_web.ttf','../font/saysettha_web.woff','../font/saysettha_web.eot']}
-        },
-      filename:'./timeout.js' // Intentional (simulated) error - the file never loads, simulating a server timeout.
-      }); 
-  }
+// Insert a keyboard that will generate a timing error.  
+  kmw.addKeyboards({id:'timeout',name:'timeout',
+    languages:{
+      id:'lo',name:'debugging',region:'Asia',
+      font:{family:'LaoWeb',source:['../font/saysettha_web.ttf','../font/saysettha_web.woff','../font/saysettha_web.eot']}
+      },
+    filename:'./timeout.js' // Intentional (simulated) error - the file never loads, simulating a server timeout.
+    }); 
+}
+
+function badStubRequest(entry) {
+  switch(entry) {
+    case 1:
+      kmw.addKeyboards('1nval1d5tub@reque5t'); 
+      break;
+    case 2:
+      keyman.addKeyboardsForLanguage(['PigLatn','1337sp34k']);
+      break;
+  } 
+}
\ No newline at end of file
diff --git a/web/src/test/manual/web/sentry-integration/index.html b/web/src/test/manual/web/sentry-integration/index.html
index ca7f7a66eb..db48ca02d2 100644
--- a/web/src/test/manual/web/sentry-integration/index.html
+++ b/web/src/test/manual/web/sentry-integration/index.html
@@ -72,6 +72,10 @@
     <h3>or in this input field:</h3>
     <input class='test' value='' placeholder='or here'/>
 
+    <h3>Trigger stub registration errors:</h3>
+    <input type='button' id='btnStub1' onclick='badStubRequest(1);' value='Request single stub' />
+    <input type='button' id='btnStub2' onclick='badStubRequest(2);' value='Request stubs for two invalid languages' />
+
     <!--  The following elements show how the language menu can be dynamically extended at any time -->
     <h3>Add a keyboard by keyboard name:</h3>
     <input type='input' id='kbd_id1' class='kmw-disabled' onkeypress="clickOnEnter(event,1);"/>