FATAL EXCEPTION - dvm crash ?

Hello !

I've recently made a new game (https://play.google.com/store/apps/details?id=infinity.pixel.nodes). I'm having a lot (around 1%) of errors like this one... Mostly on android 4.4. I have no idea where those errors come from. It seems to crash when i'm loading the level.

 java.lang.Error: FATAL EXCEPTION [UnityMain]
 Unity version : 4.5.4f1
 Device model : samsung SM-G357FZ
 Device fingerprint: xxxxxxx
 
 Caused by: java.lang.Error: signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 00000009
 Build fingerprint: 'samsung/heatqltexx/heatqlte:4.4.4/xxxxxx:user/release-keys'
 Revision: '2'
 pid: 4242, tid: 4261, name: UnityMain >>> infinity.pixel.nodes <<<
 r0 678bac00 r1 00000001 r2 699c91b0 r3 0066ce01
 r4 63a67fb0 r5 0066ce0d r6 00000001 r7 63a67fb4
 r8 62741db0 r9 0000000c sl 63a67fb8 fp 657eb778
 ip 10a54001 sp 62741d28 lr 61a10590 pc 622558e0 cpsr 50343855
 
 at libunity.009018e0(Native Method)
 at libunity.000bc58c(Native Method)
 at libunity.000b98f4(Native Method)
 at libunity.003af808(Native Method)
 at libunity.00183544(Native Method)
 at libunity.00183308(Native Method)
 at libunity.00217f98(Native Method)
 at libunity.00189024(Native Method)
 at libunity.001f4844(Native Method)
 at libunity.000dc088(Native Method)
 at libunity.000de408(Native Method)
 at libunity.000e47fc(Native Method)
 at libunity.000ef15c(Native Method)
 at libunity.000ef844(Native Method)
 at libunity.0010bce0(Native Method)
 at libunity.0029be28(Native Method)
 at libunity.0029cd9c(Native Method)
 at libunity.003c5108(Native Method)
 at libunity.003ce498(Native Method)
 at libdvm.dvmPlatformInvoke(dvmPlatformInvoke:112)
 at libdvm.dvmCallJNIMethod(unsigned int const*, JValue*, Method const*, Thread*)(dvmCallJNIMethod:398)
 at libdvm.00029be0(Native Method)
 at libdvm.dvmMterpStd(Thread*)(dvmMterpStd:76)
 at libdvm.dvmInterpret(Thread*, Method const*, JValue*)(dvmInterpret:184)
 at libdvm.dvmCallMethodV(Thread*, Method const*, Object*, bool, JValue*, std::__va_list)(dvmCallMethodV:336)
 at libdvm.dvmCallMethod(Thread*, Method const*, Object*, JValue*, ...)(dvmCallMethod:20)
 at libdvm.0005855b(Native Method)
 at libc.__thread_entry(__thread_entry:72)
 at libc.pthread_create(pthread_create:240)

Anyone have an idea ?

Thanks !