You're running a version of Zotero from March. You should install the latest version from the download page and figure out why you haven't received automatic updates in months.
If you continue to have problems with Zotero 10, restart in Troubleshooting Mode (Help → "Restart in Troubleshooting Mode…”), which temporarily disables all plugins. If that fixes it, you'll need to identify the plugin that's causing it and then report the problem to the plugin's developer.
Upgrade Storage
If you continue to have problems with Zotero 10, restart in Troubleshooting Mode (Help → "Restart in Troubleshooting Mode…”), which temporarily disables all plugins. If that fixes it, you'll need to identify the plugin that's causing it and then report the problem to the plugin's developer.