Pidgin icon doesn't show in system tray

[yaip]

Sometimes, the Pidgin icon doesn't show in the system tray. I know it's
running as when I hover my mouse over the empty space in system tray, it
says "Pidgin - Available". However, I can't right-click to access the
context menu. So I can't access my buddy list. I tried restarting Pidgin but
no luck.

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