diff --git a/python/src/com/jetbrains/python/codeInsight/controlflow/PyTypeAssertionEvaluator.java b/python/src/com/jetbrains/python/codeInsight/controlflow/PyTypeAssertionEvaluator.java
index 52a720c10925..e7869e9c5416 100644
--- a/python/src/com/jetbrains/python/codeInsight/controlflow/PyTypeAssertionEvaluator.java
+++ b/python/src/com/jetbrains/python/codeInsight/controlflow/PyTypeAssertionEvaluator.java
@@ -103,20 +103,18 @@ public class PyTypeAssertionEvaluator extends PyRecursiveElementVisitor {
       final boolean leftIsNone = lhs instanceof PyNoneLiteralExpression || PyNames.NONE.equals(lhs.getName());
       final boolean rightIsNone = rhs instanceof PyNoneLiteralExpression || PyNames.NONE.equals(rhs.getName());
 
-      if (leftIsNone && rightIsNone) {
-        return;
-      }
+      if (leftIsNone ^ rightIsNone) {
+        final PyReferenceExpression target = (PyReferenceExpression)(rightIsNone ? lhs : rhs);
 
-      final PyReferenceExpression target = (PyReferenceExpression)(rightIsNone ? lhs : rhs);
+        if (node.isOperator(PyNames.IS)) {
+          pushAssertion(target, myPositive, false, context -> PyNoneType.INSTANCE);
+          return;
+        }
 
-      if (node.isOperator(PyNames.IS)) {
-        pushAssertion(target, myPositive, false, context -> PyNoneType.INSTANCE);
-        return;
-      }
-
-      if (node.isOperator("isnot")) {
-        pushAssertion(target, !myPositive, false, context -> PyNoneType.INSTANCE);
-        return;
+        if (node.isOperator("isnot")) {
+          pushAssertion(target, !myPositive, false, context -> PyNoneType.INSTANCE);
+          return;
+        }
       }
     }
 
diff --git a/python/testSrc/com/jetbrains/python/PyTypeTest.java b/python/testSrc/com/jetbrains/python/PyTypeTest.java
index 17500d3eafea..f5de040c43c5 100644
--- a/python/testSrc/com/jetbrains/python/PyTypeTest.java
+++ b/python/testSrc/com/jetbrains/python/PyTypeTest.java
@@ -3244,6 +3244,14 @@ public class PyTypeTest extends PyTestCase {
                     "expr = T");
   }
 
+  // PY-29748
+  public void testAfterIdentityComparison() {
+    doTest("int",
+           "a = 1\n" +
+           "if a is a:\n" +
+           "   expr = a");
+  }
+
   private static List<TypeEvalContext> getTypeEvalContexts(@NotNull PyExpression element) {
     return ImmutableList.of(TypeEvalContext.codeAnalysis(element.getProject(), element.getContainingFile()).withTracing(),
                             TypeEvalContext.userInitiated(element.getProject(), element.getContainingFile()).withTracing());