diff --git a/ui/src/components/AgentConfigForm.tsx b/ui/src/components/AgentConfigForm.tsx
index c3c9bdfa..8c4f2ff8 100644
--- a/ui/src/components/AgentConfigForm.tsx
+++ b/ui/src/components/AgentConfigForm.tsx
@@ -831,7 +831,7 @@ export function AgentConfigForm(props: AgentConfigFormProps) {
                   onCommit={(v) =>
                     isCreate
                       ? set!({ extraArgs: v })
-                      : mark("adapterConfig", "extraArgs", v ? parseCommaArgs(v) : undefined)
+                      : mark("adapterConfig", "extraArgs", v?.trim() ? parseCommaArgs(v) : null)
                   }
                   immediate
                   className={inputClass}