diff --git a/distrho/src/jackbridge/JackBridge.cpp b/distrho/src/jackbridge/JackBridge.cpp
index c5f6aea6..0ff70fe6 100644
--- a/distrho/src/jackbridge/JackBridge.cpp
+++ b/distrho/src/jackbridge/JackBridge.cpp
@@ -2036,6 +2036,7 @@ uint32_t jackbridge_transport_query(const jack_client_t* client, jack_position_t
     if (pos != nullptr)
     {
         // invalidate
+        std::memset(pos, 0, sizeof(*pos));
         pos->unique_1 = 0;
         pos->unique_2 = 1;
     }
diff --git a/distrho/src/jackbridge/RtAudioBridge.hpp b/distrho/src/jackbridge/RtAudioBridge.hpp
index 3d4f0ff2..de8972a6 100644
--- a/distrho/src/jackbridge/RtAudioBridge.hpp
+++ b/distrho/src/jackbridge/RtAudioBridge.hpp
@@ -177,7 +177,8 @@ struct RtAudioBridge {
 
         if (self->jackProcessCallback == nullptr)
         {
-            std::memset((float*)outputBuffer, 0, sizeof(float)*numFrames*DISTRHO_PLUGIN_NUM_OUTPUTS);
+            if (outputBuffer != nullptr)
+                std::memset((float*)outputBuffer, 0, sizeof(float)*numFrames*DISTRHO_PLUGIN_NUM_OUTPUTS);
             return 0;
         }
 
@@ -186,14 +187,18 @@ struct RtAudioBridge {
 
         uint i = 0;
 # if DISTRHO_PLUGIN_NUM_INPUTS > 0
-        float* const insPtr  = (float*)inputBuffer;
-        for (uint j=0; j<DISTRHO_PLUGIN_NUM_INPUTS; ++j, ++i)
-            selfAudioBuffers[i] = insPtr + (j * numFrames);
+        if (float* const insPtr  = (float*)inputBuffer)
+        {
+            for (uint j=0; j<DISTRHO_PLUGIN_NUM_INPUTS; ++j, ++i)
+                selfAudioBuffers[i] = insPtr + (j * numFrames);
+        }
 # endif
 # if DISTRHO_PLUGIN_NUM_OUTPUTS > 0
-        float* const outsPtr = (float*)outputBuffer;
-        for (uint j=0; j<DISTRHO_PLUGIN_NUM_OUTPUTS; ++j, ++i)
-            selfAudioBuffers[i] = outsPtr + (j * numFrames);
+        if (float* const outsPtr = (float*)outputBuffer)
+        {
+            for (uint j=0; j<DISTRHO_PLUGIN_NUM_OUTPUTS; ++j, ++i)
+                selfAudioBuffers[i] = outsPtr + (j * numFrames);
+        }
 # endif
 #endif