glDrawArrays crashes after drawing more than 3 models

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C++

OpenGL

GLSL

Hi,
I've made Phong shaders and they worked well on 3 first objects. When I try to add one more, the first 3 appear messed up completely. When I try to load another one, the program crashes with access violation on the command:
glDrawArrays( GL_TRIANGLES, 0, pvertices->size());
Ideas anyone?