diff --git a/packages/app/src/adapters/claude-adapter.ts b/packages/app/src/adapters/claude-adapter.ts
index 1834eddf..f25f60b6 100644
--- a/packages/app/src/adapters/claude-adapter.ts
+++ b/packages/app/src/adapters/claude-adapter.ts
@@ -103,6 +103,9 @@ async function readSSE(
         }
       }
     }
+  } catch (err) {
+    if (signal?.aborted) return
+    onError(err instanceof Error ? err.message : 'Stream read error')
   } finally {
     reader.cancel().catch(() => {})
   }
diff --git a/packages/app/src/adapters/openrouter-adapter.ts b/packages/app/src/adapters/openrouter-adapter.ts
index 8bfec97e..23471888 100644
--- a/packages/app/src/adapters/openrouter-adapter.ts
+++ b/packages/app/src/adapters/openrouter-adapter.ts
@@ -109,6 +109,9 @@ async function readSSE(
         }
       }
     }
+  } catch (err) {
+    if (signal?.aborted) return
+    onError(err instanceof Error ? err.message : 'Stream read error')
   } finally {
     reader.cancel().catch(() => {})
   }
diff --git a/packages/app/src/composables/useAI.ts b/packages/app/src/composables/useAI.ts
index 9108e561..e8064e01 100644
--- a/packages/app/src/composables/useAI.ts
+++ b/packages/app/src/composables/useAI.ts
@@ -311,6 +311,9 @@ async function readSSE(
         }
       }
     }
+  } catch (err) {
+    if (signal?.aborted) return
+    onError(err instanceof Error ? err.message : 'Stream read error')
   } finally {
     reader.cancel().catch(() => {})
   }