From Raymond de Vries, "This fix tests the right variable before it is allocated. Fortunately, until now it tested another variable (_particleSizeUniform, which is, at that moment, not allocated as well) and everything went ok. So it does not fix a crash or so, it is a matter of correct code.

Line 353 is changed from

if (!_particleSizeUniform)

to

if (!_particleColorUniform)
"

src/osgParticle/PrecipitationEffect.cpp

@@ -350,7 +350,7 @@ void PrecipitationEffect::update()
         }
         else _inversePeriodUniform->set(1.0f/_period);
 
-        if (!_particleSizeUniform)
+        if (!_particleColorUniform)
         {
             _particleColorUniform = new osg::Uniform("particleColour", _particleColor);
             _stateset->addUniform(_particleColorUniform.get());