diff --git a/apps/server/src/services/llm/providers/anthropic.ts b/apps/server/src/services/llm/providers/anthropic.ts
index 5175ed2370..bfcd434ea7 100644
--- a/apps/server/src/services/llm/providers/anthropic.ts
+++ b/apps/server/src/services/llm/providers/anthropic.ts
@@ -132,7 +132,7 @@ export class AnthropicProvider extends BaseProvider {
         }
 
         const systemPrompt = this.buildSystemPrompt(messages, config);
-        const chatMessages = messages.filter(m => m.role !== "system");
+        const chatMessages = messages.filter(m => m.role !== "system" && m.content);
         const coreMessages = this.buildMessages(chatMessages, systemPrompt);
 
         const thinkingBudget = config.thinkingBudget || 10000;
diff --git a/apps/server/src/services/llm/providers/base_provider.ts b/apps/server/src/services/llm/providers/base_provider.ts
index 02fd4c6bb3..47842013d2 100644
--- a/apps/server/src/services/llm/providers/base_provider.ts
+++ b/apps/server/src/services/llm/providers/base_provider.ts
@@ -144,7 +144,7 @@ export abstract class BaseProvider implements LlmProvider {
 
     chat(messages: LlmMessage[], config: LlmProviderConfig): StreamResult {
         const systemPrompt = this.buildSystemPrompt(messages, config);
-        const chatMessages = messages.filter(m => m.role !== "system");
+        const chatMessages = messages.filter(m => m.role !== "system" && m.content);
         const coreMessages = this.buildMessages(chatMessages, systemPrompt);
 
         const streamOptions: Parameters<typeof streamText>[0] = {