Expression.Error: We don't support query strings containing keys without values in this context.

I was wondering if anyone knew what this error meant. 

A bit of background, I'm building this dashboard for a client and the datasources are stored on Sharepoint. This morning Power BI failed to refresh. After some investigation it was found that someone on the client side removed one of the datasources (yikes I know!) However after the datasource was recovered I am getting this error and it is popping up on the most random steps. It popped up on a Sorted Rows step.  After removing that it now gives me that same error on a merged query step, however there are 2 merged queries steps and the first one doesn't present a problem. I checked the query it was merged with and everything checks out.

I also tried removing everything back through the Sorted Rows step and try simply sorting the row manually and I also got that error. For reference, the steps this error is occuring on are:
#"Sorted Rows1" = Table.Sort(#"Filtered Rows4",{{"Date", Order.Ascending}})

and (when the above step is removed)

#"Merged Queries1" = Table.NestedJoin(#"Added Index", {"Column 1", Column 2}, #"Query", {"Column 1", "Column 2"}, "Query Name", JoinKind.LeftOuter)