Fix a crash caused by not guarding against `InferenceError` when calling `infer_call_result`

Close #3690

3 files changed, 27 insertions, 4 deletions

diff --git a/ChangeLog b/ChangeLog
index 33128066d..cc7d08901 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -34,6 +34,15 @@ Release date: TBA
 
 * Fix `pre-commit` config that could lead to undetected duplicate lines of code
 
+
+What's New in Pylint 2.5.4?
+===========================
+
+* Fix a crash caused by not guarding against `InferenceError` when calling `infer_call_result`
+
+  Close #3690
+
+
 What's New in Pylint 2.5.3?
 ===========================
 
diff --git a/pylint/checkers/base.py b/pylint/checkers/base.py
index 890cec5bc..e93ad66e5 100644
--- a/pylint/checkers/base.py
+++ b/pylint/checkers/base.py
@@ -1134,10 +1134,13 @@ class BasicChecker(_BasicChecker):
             # If the constant node is a FunctionDef or Lambda then
             #  it may be a illicit function call due to missing parentheses
             call_inferred = None
-            if isinstance(inferred, astroid.FunctionDef):
-                call_inferred = inferred.infer_call_result()
-            elif isinstance(inferred, astroid.Lambda):
-                call_inferred = inferred.infer_call_result(node)
+            try:
+                if isinstance(inferred, astroid.FunctionDef):
+                    call_inferred = inferred.infer_call_result()
+                elif isinstance(inferred, astroid.Lambda):
+                    call_inferred = inferred.infer_call_result(node)
+            except astroid.InferenceError:
+                call_inferred = None
             if call_inferred:
                 try:
                     for inf_call in call_inferred:
diff --git a/tests/functional/r/regression_infer_call_result_3690.py b/tests/functional/r/regression_infer_call_result_3690.py
new file mode 100644
index 000000000..0949d9439
--- /dev/null
+++ b/tests/functional/r/regression_infer_call_result_3690.py
@@ -0,0 +1,11 @@
+# pylint: disable-msg=missing-docstring,too-few-public-methods,using-constant-test
+
+class Class:
+    @property
+    @classmethod
+    def func(cls):
+        pass
+
+
+if Class.func:
+    pass