diff --git a/more_math/Parser/UnifiedMathVisitor.py b/more_math/Parser/UnifiedMathVisitor.py
index 2e43ba8..e857402 100644
--- a/more_math/Parser/UnifiedMathVisitor.py
+++ b/more_math/Parser/UnifiedMathVisitor.py
@@ -362,6 +362,7 @@ class UnifiedMathVisitor(MathExprVisitor):
         self._owned_tensors = weakref.WeakValueDictionary()
 
     def visit(self, tree):
+        throw_exception_if_processing_interrupted()
         if tree is None:
             return None