From bd89bccf60e1d611330c841288ae692d88620310 Mon Sep 17 00:00:00 2001
From: Onur Temizkan <onur@narval.co.uk>
Date: Thu, 5 Dec 2024 19:09:52 +0000
Subject: [PATCH] Guard against undefined.

---
 .../src/instrumentation.ts                           | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/plugins/node/opentelemetry-instrumentation-pg/src/instrumentation.ts b/plugins/node/opentelemetry-instrumentation-pg/src/instrumentation.ts
index a78029ce00..abdbed59b1 100644
--- a/plugins/node/opentelemetry-instrumentation-pg/src/instrumentation.ts
+++ b/plugins/node/opentelemetry-instrumentation-pg/src/instrumentation.ts
@@ -152,11 +152,15 @@ export class PgInstrumentation extends InstrumentationBase<PgInstrumentationConf
       'pg',
       SUPPORTED_PG_VERSIONS,
       (module: any) => {
-        this._patchPgClient(module.Client);
+        const moduleExports = extractModuleExports(module);
+
+        this._patchPgClient(moduleExports.Client);
         return module;
       },
       (module: any) => {
-        this._unpatchPgClient(module.Client);
+        const moduleExports = extractModuleExports(module);
+
+        this._unpatchPgClient(moduleExports.Client);
         return module;
       },
       [modulePgClient, modulePgNativeClient]
@@ -187,6 +191,10 @@ export class PgInstrumentation extends InstrumentationBase<PgInstrumentationConf
   }
 
   private _patchPgClient(module: any) {
+    if (!module) {
+      return;
+    }
+
     const moduleExports = extractModuleExports(module);
 
     if (isWrapped(moduleExports.prototype.query)) {