Fatal error: Allowed memory

Good Afternoon,

Every since I upgraded our production wordpress to 4.9.7 we’ve been getting this error what seems to be randomly.

Fatal error: Allowed memory size of 2097152000 bytes exhausted (tried to allocate 17179869292 bytes) in E:\Apache2\htdocs\nwgvcop\wp-includes\functions.php on line 5231

Everything works correctly on the test site, but we are getting this error on the production site. Do you have any suggestions?