Index: src/saveload/ai_sl.cpp
===================================================================
--- src/saveload/ai_sl.cpp	(revision 22836)
+++ src/saveload/ai_sl.cpp	(working copy)
@@ -66,6 +66,8 @@
 
 	CompanyID index;
 	while ((index = (CompanyID)SlIterateArray()) != (CompanyID)-1) {
+		if (index >= MAX_COMPANIES) SlErrorCorrupt("Too many AI configs");
+
 		_ai_saveload_version = -1;
 		SlObject(NULL, _ai_company);