Synapse Analytics Pipeline Failed to Run with TypeError

Question

I get the following error when trying to run a pipeline I previously ran successfully. I tried the disconnecting of the GitHub repo step with no success. I have another pipeline in the same workspace that runs fine. The one I'm having issues with is using a ForEach activity. If I put a breakpoint before the foreach, it will run.

Looking around the forums, similar issues usually lead to a bug reported to the MS team against Synapse Analytics.

{"stack":"Error: TypeError: Cannot read properties of undefined (reading 'name')\n at A.<anonymous> (https://web.azuresynapse.net/main.19855948db22efed.js:1:10317613)\n at Generator.throw (<anonymous>)\n at W (https://web.azuresynapse.net/main.19855948db22efed.js:1:12111835)\n at H.invoke (https://web.azuresynapse.net/polyfills.ba82112f77221c73.js:1:124629)\n at Object.onInvoke (https://web.azuresynapse.net/main.19855948db22efed.js:1:12443982)\n at H.invoke (https://web.azuresynapse.net/polyfills.ba82112f77221c73.js:1:124567)\n at Ae.run (https://web.azuresynapse.net/polyfills.ba82112f77221c73.js:1:119906)\n at https://web.azuresynapse.net/polyfills.ba82112f77221c73.js:1:134995\n at H.invokeTask (https://web.azuresynapse.net/polyfills.ba82112f77221c73.js:1:125251)\n at Object.onInvokeTask (https://web.azuresynapse.net/main.19855948db22efed.js:1:12443785)\n at H.invokeTask (https://web.azuresynapse.net/polyfills.ba82112f77221c73.js:1:125171)\n at Ae.runTask (https://web.azuresynapse.net/polyfills.ba82112f77221c73.js:1:120552)\n at Be (https://web.azuresynapse.net/polyfills.ba82112f77221c73.js:1:127299)\n at Y.invokeTask [as invoke] (https://web.azuresynapse.net/polyfills.ba82112f77221c73.js:1:126348)\n at V (https://web.azuresynapse.net/polyfills.ba82112f77221c73.js:1:138551)\n at HTMLButtonElement.Ie (https://web.azuresynapse.net/polyfills.ba82112f77221c73.js:1:138816)","message":"TypeError: Cannot read properties of undefined (reading 'name')"}

Answer 1

After debugging step-by-step in the ForEach activity, I narrowed it to a DataFlow Activity that used a Data Flowlet. I had to add some sample input data in the Debug Settings to get rid of the error. I don't understand why that was necessary when it worked before though.