diff --git a/ops.cc b/ops.cc
index c54ad12..2588ea4 100644
--- a/ops.cc
+++ b/ops.cc
@@ -242,6 +242,26 @@ T_OpContext::T_OpContext(
 	}
 }
 
+namespace {
+struct T_RunGuard
+{
+	T_OpContext& context;
+	T_RunGuard( T_OpContext& ctx ) noexcept : context( ctx ) {}
+
+	~T_RunGuard( )
+	{
+		while ( !context.profiling.empty( ) ) {
+			Globals::Profiler( ).end( context.profiling.last( ) );
+			context.profiling.removeLast( );
+		}
+		glUseProgram( 0 );
+		glBindProgramPipeline( 0 );
+		glBindFramebuffer( GL_FRAMEBUFFER , 0 );
+		Globals::Textures( ).reset( );
+	}
+};
+}
+
 void T_OpContext::run(
 		const E_RunTarget target ,
 		const float time ,
@@ -249,6 +269,8 @@ void T_OpContext::run(
 		const float height )
 {
 	assert( !aborted );
+
+	T_RunGuard rg( *this );
 	x87sp = 0;
 	instrPtr = program.ops.firstOf( target == R_INIT ? program.init : program.frame );
 	values[ 0 ] = time;