diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 981380c70de8e..7f11495508bdf 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -17164,7 +17164,7 @@ namespace ts {
             if (targetDeclarationKind !== SyntaxKind.Unknown) {
                 const decl = getDeclarationOfKind(resolvedRequire, targetDeclarationKind);
                 // function/variable declaration should be ambient
-                return !!(decl.flags & NodeFlags.Ambient);
+                return !!decl && !!(decl.flags & NodeFlags.Ambient);
             }
             return false;
         }
diff --git a/tests/baselines/reference/noCrashOnParameterNamedRequire.js b/tests/baselines/reference/noCrashOnParameterNamedRequire.js
new file mode 100644
index 0000000000000..beb7429a47c95
--- /dev/null
+++ b/tests/baselines/reference/noCrashOnParameterNamedRequire.js
@@ -0,0 +1,11 @@
+//// [index.js]
+(function(require, module, exports){
+    const mod = require("./mod");
+    mod.foo;
+})(null, null, null);
+
+//// [index.js]
+(function (require, module, exports) {
+    var mod = require("./mod");
+    mod.foo;
+})(null, null, null);
diff --git a/tests/baselines/reference/noCrashOnParameterNamedRequire.symbols b/tests/baselines/reference/noCrashOnParameterNamedRequire.symbols
new file mode 100644
index 0000000000000..824a61db10fed
--- /dev/null
+++ b/tests/baselines/reference/noCrashOnParameterNamedRequire.symbols
@@ -0,0 +1,14 @@
+=== tests/cases/compiler/index.js ===
+(function(require, module, exports){
+>require : Symbol(require, Decl(index.js, 0, 10))
+>module : Symbol(module, Decl(index.js, 0, 18))
+>exports : Symbol(exports, Decl(index.js, 0, 26))
+
+    const mod = require("./mod");
+>mod : Symbol(mod, Decl(index.js, 1, 9))
+>require : Symbol(require, Decl(index.js, 0, 10))
+
+    mod.foo;
+>mod : Symbol(mod, Decl(index.js, 1, 9))
+
+})(null, null, null);
diff --git a/tests/baselines/reference/noCrashOnParameterNamedRequire.types b/tests/baselines/reference/noCrashOnParameterNamedRequire.types
new file mode 100644
index 0000000000000..2fe629f9d5190
--- /dev/null
+++ b/tests/baselines/reference/noCrashOnParameterNamedRequire.types
@@ -0,0 +1,25 @@
+=== tests/cases/compiler/index.js ===
+(function(require, module, exports){
+>(function(require, module, exports){    const mod = require("./mod");    mod.foo;})(null, null, null) : void
+>(function(require, module, exports){    const mod = require("./mod");    mod.foo;}) : (require: any, module: any, exports: any) => void
+>function(require, module, exports){    const mod = require("./mod");    mod.foo;} : (require: any, module: any, exports: any) => void
+>require : any
+>module : any
+>exports : any
+
+    const mod = require("./mod");
+>mod : any
+>require("./mod") : any
+>require : any
+>"./mod" : "./mod"
+
+    mod.foo;
+>mod.foo : any
+>mod : any
+>foo : any
+
+})(null, null, null);
+>null : null
+>null : null
+>null : null
+
diff --git a/tests/cases/compiler/noCrashOnParameterNamedRequire.ts b/tests/cases/compiler/noCrashOnParameterNamedRequire.ts
new file mode 100644
index 0000000000000..bb4b9d53460f6
--- /dev/null
+++ b/tests/cases/compiler/noCrashOnParameterNamedRequire.ts
@@ -0,0 +1,8 @@
+// @allowJs: true
+// @checkJs: true
+// @outDir: ./built
+// @filename: index.js
+(function(require, module, exports){
+    const mod = require("./mod");
+    mod.foo;
+})(null, null, null);
\ No newline at end of file