Steps to Reproduce
1. Navigate to any existing problem record [PRB0000011] on IE11 browser
2. Go to related list > incidents tab on the problem form
3. Click on Filter button and any condition (Field : priority, oper: is , value : Critical). Click on Run button to apply filter
Notice that there is an error on the console "Unable to get property 'firstChild' of undefined or null reference"
Works fine with console not opened.
Related Problem: PRB1153124