There was an attempt to perform an action on a zero-sized window

Hello hina,

I thought you were right to try a delay.  I did a quick community search and found 2 related solved issues.  Could you post a code snip?  Are you scripting or Keyword testing?

Help with "Zero-sized Window" error? | SmartBear Community
There was an attempt to perform an action on zero sized window | SmartBear Community

Another idea is to verify the object state or insert a waitproperty method call.

WaitProperty Method:
https://support.smartbear.com/testcomplete/docs/reference/test-objects/members/common-for-all/waitproperty-method.html

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