diff --git a/packages/pinia/src/rootStore.ts b/packages/pinia/src/rootStore.ts
index 2de789f34d..fea2bcfb8c 100644
--- a/packages/pinia/src/rootStore.ts
+++ b/packages/pinia/src/rootStore.ts
@@ -6,6 +6,7 @@ import {
   InjectionKey,
   Ref,
 } from 'vue'
+import { createPinia } from './createPinia'
 import {
   StateTree,
   PiniaCustomProperties,
@@ -42,8 +43,21 @@ interface _SetActivePinia {
 /**
  * Get the currently active pinia if there is any.
  */
-export const getActivePinia = () =>
-  (hasInjectionContext() && inject(piniaSymbol)) || activePinia
+export const getActivePinia = () => {
+  const pinia = (hasInjectionContext() && inject(piniaSymbol))
+
+  if (pinia) return pinia
+
+  if (import.meta.server) {
+    console.error(
+      'Pinia instance not found in context and cannot fall back to global activePinia on server - this would lead to shared state between requests, instead it falls back to new pinia'
+    )
+
+    return createPinia()
+  }
+
+  return activePinia
+}
 
 /**
  * Every application must own its own pinia to be able to create stores