I got that too, though I also get it quite often on 7.40 when doing dynpro things in ADT. In my experience it doesn't crash anything, just the popup appears and I think syntax highlighting stops working in SE80.
From SAP GUI 7.50 PL3 release notes (Content Info):
2548218 - ABAP editor runs out of memory
SAP note 2548218 - ABAP editor runs out of memory
is updated with SAP GUI 7.50 PL4
SAPgui 7500 Patch Level 0 Collects up to 100 time more alternatives than SAPgui 7400 SAPgui 7500 Patch Level 3 Collects up to 10 time more alternatives than SAPgui 7400 SAPgui 7500 Patch Level 4 Collects the same ammount of alternatives than SAPgui 7400
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