Unity crash on startup

Unity crashes when starting up. If I select a different project by holding ALT when starting up it works just fine. But when I switch back to this specific project Unity crashes.

I work on a mac using OSX 10.6.8 and Unity version 4.1.2.

The Editor.log file contains this text:

Initialize mono Mono path[0] = '/Applications/Unity/Unity.app/Contents/Frameworks/Managed' Mono path[1] = '/Applications/Unity/Unity.app/Contents/Frameworks/Mono/lib/mono/2.0' Mono config path = '/Applications/Unity/Unity.app/Contents/Frameworks/Mono/etc' Using monoOptions --debugger-agent=transport=dt_socket,embedding=1,defer=y 2015-01-18 20:02:36.821 Unity[266:207] NSDocumentController Info.plist warning: The values of CFBundleTypeRole entries must be 'Editor', 'Viewer', 'None', or 'Shell'.

LICENSE SYSTEM [2015118 20:2:36] No start/stop license dates set

LICENSE SYSTEM [2015118 20:2:36] Next license update check is after 2015-01-19T18:53:09

IsTimeToCheckForNewEditor: Update time 1421607248 current 1421607756 /Users/timcommandeur/VoxelEngine kopie Loading GUID <-> Path mappings ... 0.002297 seconds. Loading Asset Database ... 0.005395 seconds AssetDatabase consistency checks ... 0.017064 seconds Initialize engine version: 4.1.2f1 (911c7369eeac) GfxDevice: creating device client; threaded=1 OpenGL: Version: OpenGL 2.1 [2.1 NVIDIA-1.6.36] Renderer: NVIDIA GeForce 9600M GT OpenGL Engine Vendor: NVIDIA Corporation VRAM: 512 MB Extensions: GL_ARB_transpose_matrix GL_ARB_vertex_program GL_ARB_vertex_blend GL_ARB_window_pos GL_ARB_shader_objects GL_ARB_vertex_shader GL_ARB_shading_language_100 GL_EXT_multi_draw_arrays GL_EXT_clip_volume_hint GL_EXT_rescale_normal GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_gpu_program_parameters GL_EXT_geometry_shader4 GL_EXT_transform_feedback GL_APPLE_client_storage GL_APPLE_specular_vector GL_APPLE_transform_hint GL_APPLE_packed_pixels GL_APPLE_fence GL_APPLE_vertex_array_object GL_APPLE_vertex_program_evaluators GL_APPLE_element_array GL_APPLE_flush_render GL_APPLE_aux_depth_stencil GL_NV_texgen_reflection GL_NV_light_max_exponent GL_IBM_rasterpos_clip GL_SGIS_generate_mipmap GL_ARB_imaging GL_ARB_point_parameters GL_ARB_texture_env_crossbar GL_ARB_texture_border_clamp GL_ARB_multitexture GL_ARB_texture_env_add GL_ARB_texture_cube_map GL_ARB_texture_env_dot3 GL_ARB_multisample GL_ARB_texture_env_combine GL_ARB_texture_compression GL_ARB_texture_mirrored_repeat GL_ARB_shadow GL_ARB_depth_texture GL_ARB_fragment_program GL_ARB_fragment_program_shadow GL_ARB_fragment_shader GL_ARB_occlusion_query GL_ARB_point_sprite GL_ARB_texture_non_power_of_two GL_ARB_vertex_buffer_object GL_ARB_pixel_buffer_object GL_ARB_draw_buffers GL_ARB_shader_texture_lod GL_ARB_color_buffer_float GL_ARB_half_float_vertex GL_ARB_texture_rg GL_ARB_texture_compression_rgtc GL_ARB_framebuffer_object GL_EXT_compiled_vertex_array GL_EXT_draw_buffers2 GL_EXT_framebuffer_object GL_EXT_framebuffer_blit GL_EXT_framebuffer_multisample GL_EXT_texture_rectangle GL_ARB_texture_rectangle GL_EXT_texture_env_add GL_EXT_blend_color GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_texture_lod_bias GL_EXT_abgr GL_EXT_bgra GL_EXT_stencil_wrap GL_EXT_texture_filter_anisotropic GL_EXT_secondary_color GL_EXT_blend_func_separate GL_EXT_shadow_funcs GL_EXT_stencil_two_side GL_EXT_depth_bounds_test GL_EXT_texture_compression_s3tc GL_EXT_texture_compression_dxt1 GL_EXT_texture_sRGB GL_EXT_blend_equation_separate GL_EXT_texture_mirror_clamp GL_EXT_packed_depth_stencil GL_EXT_bindable_uniform GL_EXT_texture_integer GL_EXT_gpu_shader4 GL_EXT_framebuffer_sRGB GL_EXT_provoking_vertex GL_APPLE_flush_buffer_range GL_APPLE_ycbcr_422 GL_APPLE_rgb_422 GL_APPLE_vertex_array_range GL_APPLE_texture_range GL_APPLE_float_pixels GL_ATI_texture_float GL_ARB_texture_float GL_ARB_half_float_pixel GL_APPLE_pixel_buffer GL_APPLE_object_purgeable GL_NV_point_sprite GL_NV_blend_square GL_NV_fog_distance GL_NV_depth_clamp GL_NV_multisample_filter_hint GL_NV_fragment_program_option GL_NV_fragment_program2 GL_NV_vertex_program2_option GL_NV_vertex_program3 GL_NV_conditional_render GL_ATI_texture_mirror_once GL_ATI_texture_env_combine3 GL_ATI_separate_stencil GL_SGIS_texture_edge_clamp GL_SGIS_texture_lod GL_EXT_texture_array GL_EXT_vertex_array_bgra GL_ARB_instanced_arrays GL_ARB_depth_buffer_float GL_EXT_packed_float GL_EXT_texture_shared_exponent Registering custom dll's ... 0.115517 seconds. Begin MonoManager ReloadAssembly Platform assembly: /Applications/Unity/Unity.app/Contents/Frameworks/Managed/UnityEngine.dll (this message is harmless) Platform assembly: /Applications/Unity/Unity.app/Contents/Frameworks/Managed/UnityEditor.dll (this message is harmless) Non platform assembly: /Users/timcommandeur/VoxelEngine kopie/Library/ScriptAssemblies/Assembly-CSharp-firstpass.dll (this message is harmless) Loading /Users/timcommandeur/VoxelEngine kopie/Library/ScriptAssemblies/Assembly-CSharp-firstpass.dll into Unity Child Domain Non platform assembly: /Users/timcommandeur/VoxelEngine kopie/Library/ScriptAssemblies/Assembly-CSharp.dll (this message is harmless) Loading /Users/timcommandeur/VoxelEngine kopie/Library/ScriptAssemblies/Assembly-CSharp.dll into Unity Child Domain Non platform assembly: /Users/timcommandeur/VoxelEngine kopie/Library/ScriptAssemblies/Assembly-UnityScript-firstpass.dll (this message is harmless) Loading /Users/timcommandeur/VoxelEngine kopie/Library/ScriptAssemblies/Assembly-UnityScript-firstpass.dll into Unity Child Domain Platform assembly: /Applications/Unity/Unity.app/Contents/Frameworks/Managed/UnityEditor.Graphs.dll (this message is harmless) Loading /Applications/Unity/Unity.app/Contents/Frameworks/Managed/UnityEditor.Graphs.dll into Unity Child Domain Platform assembly: /Applications/Unity/Unity.app/Contents/Frameworks/Mono/lib/mono/2.0/System.Core.dll (this message is harmless) Platform assembly: /Applications/Unity/Unity.app/Contents/Frameworks/Mono/lib/mono/2.0/System.dll (this message is harmless) Platform assembly: /Applications/Unity/Unity.app/Contents/Frameworks/Managed/Mono.Cecil.dll (this message is harmless) Platform assembly: /Applications/Unity/Unity.app/Contents/Frameworks/Mono/lib/mono/2.0/System.Xml.dll (this message is harmless) Platform assembly: /Applications/Unity/Unity.app/Contents/Frameworks/Mono/lib/mono/2.0/UnityScript.dll (this message is harmless) Platform assembly: /Applications/Unity/Unity.app/Contents/Frameworks/Managed/ICSharpCode.NRefactory.dll (this message is harmless) Platform assembly: /Applications/Unity/Unity.app/Contents/Frameworks/Mono/lib/mono/2.0/Boo.Lang.dll (this message is harmless) Mono: successfully reloaded assembly - Completed reload, in 0.167 seconds System memory in use before: 26.3 MB. Unloading 112 Unused Serialized files (Serialized files now loaded: 0 / Dirty serialized files: 0) System memory in use after: 23.4 MB.

Unloading 0 unused Assets to reduce memory usage. Loaded Objects now: 137. Total: 25.341721 ms (FindLiveObjects: 0.023179 ms CreateObjectMapping: 0.007764 ms MarkObjects: 0.594347 ms DeleteObjects: 0.004979 ms)

Validating Project structure ... 0.005011 seconds. Refresh, detecting if any assets need to be imported or removed ... 0.003010 seconds (Nothing changed) Platform assembly: /Applications/Unity/Unity.app/Contents/Frameworks/Mono/lib/mono/2.0/System.Xml.Linq.dll (this message is harmless) Platform assembly: /Applications/Unity/Unity.app/Contents/Frameworks/Managed/nunit.framework.dll (this message is harmless) Receiving unhandled NULL exception Launching bug reporter

*** Launching bug reporter due to crashbug. Obtained 0 stack frames. Stacktrace:

I have no idea what to do with this, does anyone know what I can do to start up my project again?