XF 1.5 Server Error:

That error would be somewhat unusual unless the table definition had been changed by something.

To verify, are you able to execute the following query, e.g. through PhpMyAdmin or similar?
Code:
SHOW CREATE TABLE xf_session
 
I'm moreso after the query output.

It will look something like this:

upload_2016-6-11_0-9-20.webp

We need the data from the Create Table column.

If it is truncated like it is there, then you may need to click "+ Options" and select "Full texts" and click Go.

upload_2016-6-11_0-10-13.webp
 
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