diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -7239,6 +7239,10 @@
   if (!CalleeFnDecl)
     return Call;
 
+  // Scope can be nullptr here if any compile error is encountered before.
+  if (!Scope)
+    return Call;
+
   if (LangOpts.OpenMP >= 51 && CalleeFnDecl->getIdentifier() &&
       CalleeFnDecl->getName().startswith_insensitive("omp_")) {
     // checking for any calls inside an Order region
diff --git a/clang/test/OpenMP/bug59944.c b/clang/test/OpenMP/bug59944.c
new file mode 100644
--- /dev/null
+++ b/clang/test/OpenMP/bug59944.c
@@ -0,0 +1,10 @@
+// RUN: %clang_cc1 -fopenmp -fopenmp-version=52 -x c -triple x86_64-apple-darwin10 %s -o - 2>&1 | FileCheck %s --check-prefix=CHECK
+
+extern void *omp_get_mapped_ptr(void *, int);
+
+void t() {
+  omp_get_mapped_ptr(&x, omp_get_initial_device());
+}
+
+// CHECK: error: use of undeclared identifier 'x'
+// CHECK-NOT: crash