diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
--- a/clang/lib/AST/ASTImporter.cpp
+++ b/clang/lib/AST/ASTImporter.cpp
@@ -2897,6 +2897,17 @@
             getCanonicalForwardRedeclChain(D2CXX);
         for (auto *R : Redecls) {
           auto *RI = cast<CXXRecordDecl>(R);
+          // Skip this declaration if it is currently under import and
+          // incomplete. Because it is under import we will reach this place in
+          // its own import call. At import of a "templated" CXXRecordDecl the
+          // described template is imported first and that import call sets the
+          // described template. But before this is done other imports happen so
+          // this case may occur.
+          if (!RI->getDescribedTemplate())
+            continue;
+          // Skip the declaration if injected type is already set.
+          if (isa<InjectedClassNameType>(RI->getTypeForDecl()))
+            continue;
           RI->setTypeForDecl(nullptr);
           // Below we create a new injected type and assign that to the
           // canonical decl, subsequent declarations in the chain will reuse
diff --git a/clang/unittests/AST/ASTImporterTest.cpp b/clang/unittests/AST/ASTImporterTest.cpp
--- a/clang/unittests/AST/ASTImporterTest.cpp
+++ b/clang/unittests/AST/ASTImporterTest.cpp
@@ -6141,6 +6141,41 @@
   EXPECT_EQ(ToAttr->getAnnotation(), "A");
 }
 
+TEST_P(ASTImporterOptionSpecificTestBase,
+       ImportOfTemplatedDeclWhenPreviousDeclHasNoDescribedTemplateSet) {
+  Decl *FromTU = getTuDecl(
+      R"(
+
+      namespace std {
+        template<typename T>
+        class basic_stringbuf;
+      }
+      namespace std {
+        class char_traits;
+        template<typename T = char_traits>
+        class basic_stringbuf;
+      }
+      namespace std {
+        template<typename T>
+        class basic_stringbuf {};
+      }
+
+      )",
+      Lang_CXX11);
+
+  auto *From1 = FirstDeclMatcher<ClassTemplateDecl>().match(
+      FromTU,
+      classTemplateDecl(hasName("basic_stringbuf"), unless(isImplicit())));
+  auto *To1 = cast_or_null<ClassTemplateDecl>(Import(From1, Lang_CXX11));
+  EXPECT_TRUE(To1);
+
+  auto *From2 = LastDeclMatcher<ClassTemplateDecl>().match(
+      FromTU,
+      classTemplateDecl(hasName("basic_stringbuf"), unless(isImplicit())));
+  auto *To2 = cast_or_null<ClassTemplateDecl>(Import(From2, Lang_CXX11));
+  EXPECT_TRUE(To2);
+}
+
 INSTANTIATE_TEST_CASE_P(ParameterizedTests, ASTImporterLookupTableTest,
                         DefaultTestValuesForRunOptions, );