Can't track down Accessed None 'CallFunc_GetController_ReturnValue5'

I’ve got it on one of my blueprints that pops up between when my character is spawned and when I take possession of the character. It started with a Event Dispatcher, but once I deleted that the error would show up as coming from a different function altogether. The error would only jump ship when I deleted the local variables out of a function. Any ideas what’s going on here?