diff --git a/src/ncp/ncp_spi.cpp b/src/ncp/ncp_spi.cpp
index e164b9c5d..7bfe4a450 100644
--- a/src/ncp/ncp_spi.cpp
+++ b/src/ncp/ncp_spi.cpp
@@ -289,6 +289,8 @@ ThreadError NcpSpi::PrepareNextSpiSendFrame(void)
     if (errorCode != kThreadError_None)
     {
         mTxState = kTxStateIdle;
+        mPrepareTxFrameTask.Post();
+        ExitNow();
     }
 
     // Remove the frame from tx buffer and inform the base
diff --git a/src/ncp/ncp_spi.hpp b/src/ncp/ncp_spi.hpp
index e0c36720e..aa45b4293 100644
--- a/src/ncp/ncp_spi.hpp
+++ b/src/ncp/ncp_spi.hpp
@@ -114,7 +114,6 @@ private:
 
     uint8_t mEmptySendFrame[kSpiHeaderLength];
     uint8_t mEmptyReceiveFrame[kSpiHeaderLength];
-
 };
 
 }  // namespace Thread