model: fix "earliest diverge" NULL pointer exception

diff --git a/model.cc b/model.cc
index 1598fb9a276343ba3daf59f3beedad6d452115e7..ae0a787f3ad7a776c416a47cbb302d95f03c02c2 100644 (file)
--- a/model.cc
+++ b/model.cc
@@ -183,7 +183,10 @@ bool ModelChecker::next_execution()
        num_executions++;
        if (isfinalfeasible()) {
                printf("Earliest divergence point since last feasible execution:\n");
-               earliest_diverge->print();
+               if (earliest_diverge)
+                       earliest_diverge->print();
+               else
+                       printf("(Not set)\n");
 
                earliest_diverge = NULL;
                num_feasible_executions++;