diff --git a/.changeset/blue-jeans-lick.md b/.changeset/blue-jeans-lick.md
new file mode 100644
index 00000000..40993d39
--- /dev/null
+++ b/.changeset/blue-jeans-lick.md
@@ -0,0 +1,6 @@
+---
+'@sei-js/react': patch
+'@sei-js/core': patch
+---
+
+Fixed an issue with polyfilling on Node environments be excluding environments that don't have self (non-browser environments)
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index b303bc8e..16904cfb 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -1,11 +1,14 @@
-import * as process from 'process';
-import { Buffer } from 'buffer';
+// Check if in browser environment
+if (typeof self !== 'undefined') {
+	const process = require('process');
+	const Buffer = require('buffer').Buffer;
 
-// Polyfill process and buffer for browser
-Object.assign(self, {
-	process,
-	global: self,
-	Buffer
-});
+	// Polyfill process and buffer environment variables
+	Object.assign(self, {
+		process,
+		global: self,
+		Buffer
+	});
+}
 
 export * from './lib';
diff --git a/packages/react/src/index.ts b/packages/react/src/index.ts
index b303bc8e..f41a696f 100644
--- a/packages/react/src/index.ts
+++ b/packages/react/src/index.ts
@@ -1,11 +1 @@
-import * as process from 'process';
-import { Buffer } from 'buffer';
-
-// Polyfill process and buffer for browser
-Object.assign(self, {
-	process,
-	global: self,
-	Buffer
-});
-
 export * from './lib';