diff --git a/.gitignore b/.gitignore
index 838d8452..2f13bf45 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 builds/
 CMakeLists.txt.user
 ci_shadervalidator/validateshaders
+build/
+.vscode/
\ No newline at end of file
diff --git a/McZapkie/hamulce.cpp b/McZapkie/hamulce.cpp
index 68cc4d2a..ea37533d 100644
--- a/McZapkie/hamulce.cpp
+++ b/McZapkie/hamulce.cpp
@@ -118,8 +118,7 @@ double PFVd( double PH, double PL, double const S, double LIM, double const DP )
         LIM = LIM + 1;
         PH = PH + 1.0; // wyzsze cisnienie absolutne
         PL = PL + 1.0; // nizsze cisnienie absolutne
-        assert( PH != PL );
-        double sg = PL / PH; // bezwymiarowy stosunek cisnien
+        double sg = std::min( 1.0, PL / PH ); // bezwymiarowy stosunek cisnien
         double FM = PH * 197.0 * S; // najwyzszy mozliwy przeplyw, wraz z kierunkiem
         if ((PH - LIM) < 0.1)
             FM = FM * (PH - LIM) / DP; // jesli jestesmy przy nastawieniu, to zawor sie przymyka
diff --git a/audio.cpp b/audio.cpp
index 93e34058..8dc98f8f 100644
--- a/audio.cpp
+++ b/audio.cpp
@@ -69,7 +69,7 @@ openal_buffer::openal_buffer( std::string const &Filename ) :
 	}
 	else {
 		id = null_resource;
-		ErrorLog("sound: failed to create AL buffer");
+		ErrorLog("sound: failed to create AL buffer: " + std::string(alGetString(alGetError())));
 	}
 
 	delete[] buf;
diff --git a/audiorenderer_extra.h b/audiorenderer_extra.h
index 79a2f20e..69bc2a34 100644
--- a/audiorenderer_extra.h
+++ b/audiorenderer_extra.h
@@ -17,7 +17,7 @@ openal_source::bind( sound_source *Controller, uint32_sequence Sounds, Iterator_
 
     is_multipart = ( buffers.size() > 1 );
 
-    if( id != audio::null_resource ) {
+    if( id != audio::null_resource && !buffers.empty()) {
         ::alSourceQueueBuffers( id, static_cast<ALsizei>( buffers.size() ), buffers.data() );
         ::alSourceRewind( id );
         // sound controller can potentially request playback to start from certain buffer point