diff --git a/sources/reactphysics3d/engine/ConstraintSolver.cpp b/sources/reactphysics3d/engine/ConstraintSolver.cpp
index 890c63f2..b5b6920f 100644
--- a/sources/reactphysics3d/engine/ConstraintSolver.cpp
+++ b/sources/reactphysics3d/engine/ConstraintSolver.cpp
@@ -65,6 +65,8 @@ void ConstraintSolver::allocate() {
         }
     }
 
+    assert(nbConstraints > 0);
+
     // Compute the number of bodies that are part of some active constraint
     nbBodies = bodyNumberMapping.size();