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-rw-r--r--src/ai/ai_core.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/ai/ai_core.cpp b/src/ai/ai_core.cpp
index 406b2ecbd..3ea06c0c6 100644
--- a/src/ai/ai_core.cpp
+++ b/src/ai/ai_core.cpp
@@ -47,6 +47,7 @@
Company *c = GetCompany(company);
c->ai_info = info;
+ assert(c->ai_instance == NULL);
c->ai_instance = new AIInstance(info);
InvalidateWindowData(WC_AI_DEBUG, 0, -1);