Fix possible crash in Executor

Amends d8d7beb866b24793d9c04b6996276a4a8959bfa2.

Change-Id: I6eefff5640ad1213e2ae36d7f71ba476ea4d475b
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/lib/corelib/buildgraph/executor.cpp b/src/lib/corelib/buildgraph/executor.cpp
index 06d49cb4d..72ee9d7ba 100644
--- a/src/lib/corelib/buildgraph/executor.cpp
+++ b/src/lib/corelib/buildgraph/executor.cpp
@@ -396,8 +396,10 @@ bool Executor::schedulingBlockedByJobLimit(const BuildGraphNode *node)
         if (currentJobCount == 0)
             continue;
         const auto jobLimitIsExceeded = [currentJobCount, jobPool, this](const Transformer *t) {
-            const int maxJobCount = m_jobLimitsPerProduct.at(t->product().get())
-                    .getLimit(jobPool);
+            const auto it = m_jobLimitsPerProduct.find(t->product().get());
+            if (it == m_jobLimitsPerProduct.cend())
+                return false; // See checkNodeProduct() for why this is possible
+            const int maxJobCount = it->second.getLimit(jobPool);
             return maxJobCount > 0 && currentJobCount >= maxJobCount;
         };