diff --git a/ChangeLog b/ChangeLog
index 20ce2b7a2..3f09c1959 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,15 @@
+2008-01-05	Tobias Doerffel	<tobydox/at/users/dot/sourceforge/dot/net>
+
+	* plugins/organic/organic.cpp:
+	* plugins/bit_invader/bit_invader.cpp:
+	* plugins/vibed/vibed.cpp:
+	* plugins/triple_oscillator/triple_oscillator.cpp:
+	* plugins/stk/mallets/mallets.cpp:
+	make sure, pluginData-pointer is always initialized in playNote()
+
+	* src/core/envelope_and_lfo_widget.cpp:
+	simple range-checking
+
 2008-01-04	Tobias Doerffel	<tobydox/at/users/dot/sourceforge/dot/net>
 
 	* plugins/ladspa_effect/ladspa_effect.cpp:
diff --git a/plugins/bit_invader/bit_invader.cpp b/plugins/bit_invader/bit_invader.cpp
index f6112d172..dd817073c 100644
--- a/plugins/bit_invader/bit_invader.cpp
+++ b/plugins/bit_invader/bit_invader.cpp
@@ -535,7 +535,7 @@ void bitInvader::smoothClicked( void )
 
 void bitInvader::playNote( notePlayHandle * _n, bool )
 {
-	if ( _n->totalFramesPlayed() == 0 )
+	if ( _n->totalFramesPlayed() == 0 || _n->m_pluginData == NULL )
 	{
 	
 		float factor;
diff --git a/plugins/organic/organic.cpp b/plugins/organic/organic.cpp
index 3241a12ef..f6d54c677 100644
--- a/plugins/organic/organic.cpp
+++ b/plugins/organic/organic.cpp
@@ -261,7 +261,7 @@ QString organicInstrument::nodeName( void ) const
 
 void organicInstrument::playNote( notePlayHandle * _n, bool )
 {
-	if( _n->totalFramesPlayed() == 0 )
+	if( _n->totalFramesPlayed() == 0 || _n->m_pluginData == NULL )
 	{
 		oscillator * oscs_l[m_num_oscillators];
 		oscillator * oscs_r[m_num_oscillators];
diff --git a/plugins/stk/mallets/mallets.cpp b/plugins/stk/mallets/mallets.cpp
index 4d1fb4419..662fdd956 100644
--- a/plugins/stk/mallets/mallets.cpp
+++ b/plugins/stk/mallets/mallets.cpp
@@ -219,7 +219,7 @@ void malletsInstrument::playNote( notePlayHandle * _n, bool )
 	int p = m_presetsModel.value();
 	
 	const float freq = _n->frequency();
-	if ( _n->totalFramesPlayed() == 0 )
+	if ( _n->totalFramesPlayed() == 0 || _n->m_pluginData == NULL )
 	{
 		float vel = static_cast<float>( _n->getVolume() ) / 100.0f;
 		
diff --git a/plugins/triple_oscillator/triple_oscillator.cpp b/plugins/triple_oscillator/triple_oscillator.cpp
index 700587383..1faef3e27 100644
--- a/plugins/triple_oscillator/triple_oscillator.cpp
+++ b/plugins/triple_oscillator/triple_oscillator.cpp
@@ -577,7 +577,7 @@ QString tripleOscillator::nodeName( void ) const
 
 void tripleOscillator::playNote( notePlayHandle * _n, bool )
 {
-	if( _n->totalFramesPlayed() == 0 )
+	if( _n->totalFramesPlayed() == 0 || _n->m_pluginData == NULL )
 	{
 		oscillator * oscs_l[NUM_OF_OSCILLATORS];
 		oscillator * oscs_r[NUM_OF_OSCILLATORS];
diff --git a/plugins/vibed/vibed.cpp b/plugins/vibed/vibed.cpp
index 3f1d5526c..6ff6e204a 100644
--- a/plugins/vibed/vibed.cpp
+++ b/plugins/vibed/vibed.cpp
@@ -468,7 +468,7 @@ QString vibed::nodeName( void ) const
 
 void vibed::playNote( notePlayHandle * _n, bool )
 {
-	if ( _n->totalFramesPlayed() == 0 )
+	if ( _n->totalFramesPlayed() == 0 || _n->m_pluginData == NULL )
 	{
 		_n->m_pluginData = new stringContainer( _n->frequency(),
 					engine::getMixer()->sampleRate(),
diff --git a/src/core/envelope_and_lfo_widget.cpp b/src/core/envelope_and_lfo_widget.cpp
index c088aa3d6..202b9c9bc 100644
--- a/src/core/envelope_and_lfo_widget.cpp
+++ b/src/core/envelope_and_lfo_widget.cpp
@@ -577,6 +577,11 @@ void FASTCALL envelopeAndLFOWidget::fillLevel( float * _buf, f_cnt_t _frame,
 					const f_cnt_t _release_begin,
 					const fpp_t _frames )
 {
+	if( _frame < 0 || _release_begin < 0 )
+	{
+		return;
+	}
+
 	fillLFOLevel( _buf, _frame, _frames );
 
 	for( fpp_t offset = 0; offset < _frames; ++offset, ++_buf, ++_frame )