diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2026-06-22-21-58-25.gh-issue-151763.FYc3_9.rst b/Misc/NEWS.d/next/Core_and_Builtins/2026-06-22-21-58-25.gh-issue-151763.FYc3_9.rst
new file mode 100644
index 000000000000000..0b8ef5014424ed1
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2026-06-22-21-58-25.gh-issue-151763.FYc3_9.rst
@@ -0,0 +1,3 @@
+Fix a possible double-free of ```PyObject* error_line``` in
+```_PyPegen_raise_error_known_location``` in ```pegen_errors.c``` by
+resetting it to ```NULL```. It now correctly raises ```MemoryError```.
diff --git a/Parser/pegen_errors.c b/Parser/pegen_errors.c
index 312699415efd9af..353358d14f3c788 100644
--- a/Parser/pegen_errors.c
+++ b/Parser/pegen_errors.c
@@ -391,6 +391,7 @@ _PyPegen_raise_error_known_location(Parser *p, PyObject *errtype,
     }
 
     tmp = Py_BuildValue("(OnnNnn)", p->tok->filename, lineno, col_number, error_line, end_lineno, end_col_number);
+    error_line = NULL;
     if (!tmp) {
         goto error;
     }