diff --git a/modules/juce_audio_formats/codecs/juce_AiffAudioFormat.cpp b/modules/juce_audio_formats/codecs/juce_AiffAudioFormat.cpp
index 73515f3d6d..b6cb306399 100644
--- a/modules/juce_audio_formats/codecs/juce_AiffAudioFormat.cpp
+++ b/modules/juce_audio_formats/codecs/juce_AiffAudioFormat.cpp
@@ -1003,7 +1003,7 @@ AudioFormatWriter* AiffAudioFormat::createWriterFor (OutputStream* out,
                                                      const StringPairArray& metadataValues,
                                                      int /*qualityOptionIndex*/)
 {
-    if (getPossibleBitDepths().contains (bitsPerSample))
+    if (out != nullptr && getPossibleBitDepths().contains (bitsPerSample))
         return new AiffAudioFormatWriter (out, sampleRate, numberOfChannels, (unsigned int) bitsPerSample, metadataValues);
 
     return nullptr;
diff --git a/modules/juce_audio_formats/codecs/juce_FlacAudioFormat.cpp b/modules/juce_audio_formats/codecs/juce_FlacAudioFormat.cpp
index 3d257d1374..43972b60db 100644
--- a/modules/juce_audio_formats/codecs/juce_FlacAudioFormat.cpp
+++ b/modules/juce_audio_formats/codecs/juce_FlacAudioFormat.cpp
@@ -536,7 +536,7 @@ AudioFormatWriter* FlacAudioFormat::createWriterFor (OutputStream* out,
                                                      const StringPairArray& /*metadataValues*/,
                                                      int qualityOptionIndex)
 {
-    if (getPossibleBitDepths().contains (bitsPerSample))
+    if (out != nullptr && getPossibleBitDepths().contains (bitsPerSample))
     {
         ScopedPointer<FlacWriter> w (new FlacWriter (out, sampleRate, numberOfChannels,
                                                      (uint32) bitsPerSample, qualityOptionIndex));
diff --git a/modules/juce_audio_formats/codecs/juce_LAMEEncoderAudioFormat.cpp b/modules/juce_audio_formats/codecs/juce_LAMEEncoderAudioFormat.cpp
index 9eda5014b0..8be87bf689 100644
--- a/modules/juce_audio_formats/codecs/juce_LAMEEncoderAudioFormat.cpp
+++ b/modules/juce_audio_formats/codecs/juce_LAMEEncoderAudioFormat.cpp
@@ -205,6 +205,9 @@ AudioFormatWriter* LAMEEncoderAudioFormat::createWriterFor (OutputStream* stream
                                                             const StringPairArray& metadataValues,
                                                             int qualityOptionIndex)
 {
+    if (streamToWriteTo == nullptr)
+        return nullptr;
+
     int vbr = 4;
     int cbr = 0;
 
diff --git a/modules/juce_audio_formats/codecs/juce_OggVorbisAudioFormat.cpp b/modules/juce_audio_formats/codecs/juce_OggVorbisAudioFormat.cpp
index b396c2d02b..454156f4f4 100644
--- a/modules/juce_audio_formats/codecs/juce_OggVorbisAudioFormat.cpp
+++ b/modules/juce_audio_formats/codecs/juce_OggVorbisAudioFormat.cpp
@@ -483,8 +483,12 @@ AudioFormatWriter* OggVorbisAudioFormat::createWriterFor (OutputStream* out,
                                                           const StringPairArray& metadataValues,
                                                           int qualityOptionIndex)
 {
+    if (out == nullptr)
+        return nullptr;
+
     ScopedPointer<OggWriter> w (new OggWriter (out, sampleRate, numChannels,
-                                               (unsigned int) bitsPerSample, qualityOptionIndex, metadataValues));
+                                               (unsigned int) bitsPerSample,
+                                               qualityOptionIndex, metadataValues));
 
     return w->ok ? w.release() : nullptr;
 }
diff --git a/modules/juce_audio_formats/codecs/juce_WavAudioFormat.cpp b/modules/juce_audio_formats/codecs/juce_WavAudioFormat.cpp
index 653996ea81..75603b1524 100644
--- a/modules/juce_audio_formats/codecs/juce_WavAudioFormat.cpp
+++ b/modules/juce_audio_formats/codecs/juce_WavAudioFormat.cpp
@@ -1606,7 +1606,7 @@ AudioFormatWriter* WavAudioFormat::createWriterFor (OutputStream* out, double sa
                                                     unsigned int numChannels, int bitsPerSample,
                                                     const StringPairArray& metadataValues, int /*qualityOptionIndex*/)
 {
-    if (getPossibleBitDepths().contains (bitsPerSample))
+    if (out != nullptr && getPossibleBitDepths().contains (bitsPerSample))
         return new WavAudioFormatWriter (out, sampleRate, (unsigned int) numChannels,
                                          (unsigned int) bitsPerSample, metadataValues);