From 1e9a5a18ec89dd0839b29d57801bf1ca9e0853a6 Mon Sep 17 00:00:00 2001
From: Tom Poole <thomas.poole@roli.com>
Date: Tue, 13 Mar 2018 16:34:40 +0000
Subject: [PATCH] Fixed an issue forwarding valueToText functions in the
 SliderAttachment

---
 .../utilities/juce_AudioProcessorValueTreeState.cpp        | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/modules/juce_audio_processors/utilities/juce_AudioProcessorValueTreeState.cpp b/modules/juce_audio_processors/utilities/juce_AudioProcessorValueTreeState.cpp
index a345f5ae47..3dc83c635b 100644
--- a/modules/juce_audio_processors/utilities/juce_AudioProcessorValueTreeState.cpp
+++ b/modules/juce_audio_processors/utilities/juce_AudioProcessorValueTreeState.cpp
@@ -465,8 +465,11 @@ struct AudioProcessorValueTreeState::SliderAttachment::Pimpl  : private Attached
 
         if (auto* param = dynamic_cast<AudioProcessorValueTreeState::Parameter*> (state.getParameter (paramID)))
         {
-            slider.valueFromTextFunction = [param] (const String& text) { return (double) param->textToValueFunction (text); };
-            slider.textFromValueFunction = [param] (double value)       { return param->valueToTextFunction ((float) value); };
+            if (param->textToValueFunction != nullptr)
+                slider.valueFromTextFunction = [param] (const String& text) { return (double) param->textToValueFunction (text); };
+
+            if (param->valueToTextFunction != nullptr)
+                slider.textFromValueFunction = [param] (double value)       { return param->valueToTextFunction ((float) value); };
 
             slider.setDoubleClickReturnValue (true, range.convertFrom0to1 (param->getDefaultValue()));
         }