diff --git a/misc/wasm/wasm_exec.js b/misc/wasm/wasm_exec.js
index 8501ae7cd84..ef97c4e311d 100644
--- a/misc/wasm/wasm_exec.js
+++ b/misc/wasm/wasm_exec.js
@@ -11,6 +11,7 @@
 	// - Node.js
 	// - Electron
 	// - Parcel
+	// - Webpack
 
 	if (typeof global !== "undefined") {
 		// global already exists
@@ -28,7 +29,7 @@
 
 	if (!global.fs && global.require) {
 		const fs = require("fs");
-		if (Object.keys(fs) !== 0) {
+		if (typeof fs === "object" && fs !== null && Object.keys(fs).length !== 0) {
 			global.fs = fs;
 		}
 	}
@@ -556,6 +557,7 @@
 	}
 
 	if (
+		typeof module !== "undefined" &&
 		global.require &&
 		global.require.main === module &&
 		global.process &&