It's caused by one of your plugins which uses the hook "editor_construct".
We can't see which plugin it is so you have to go to your AdminCP > plugin manager > find hook "editor_construct" and see which plugin it belongs to. If it belongs to multiple plugins, disable them one by one until it works.
Once you found the plugin that causes this, post the few lines that are around line 37 and maybe we can help you fix it.
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