Unrecognized selector sent to instance - Application crashes only on Release - ios

Question

NOTE This is more of an iOS troubleshooting question not a React Native one. So even if you're an iOS dev and not specifically into React Native, please please read further. Your help will be greatly appreciated :)
I am building a React Native app with the Agora SDK using the react native wrapper from https://github.com/syanbo/react-native-agora
I have a weird issue when launching a new Video call, I get the following error:
2019-01-23 16:20:18.512762+0530 PwcApp[786:355367] Exception '-[AgoraRtcEngineKit setClientRole:withKey:]: unrecognized selector sent to instance 0x1072a7b80' was thrown while invoking init on target Agora with params (
{
appid = c617eddc6ceb4782adb509aa91b17580;
channelProfile = 1;
clientRole = 1;
swapWidthAndHeight = 1;
videoProfile = 40;
}
)
callstack: (
0 CoreFoundation 0x00000001beb37f10 <redacted> + 252
1 libobjc.A.dylib 0x00000001bdd05a40 objc_exception_throw + 56
2 CoreFoundation 0x00000001bea4f154 <redacted> + 0
3 CoreFoundation 0x00000001beb3d810 <redacted> + 1412
4 CoreFoundation 0x00000001beb3f4bc _CF_forwarding_prep_0 + 92
5 PwcApp 0x00000001055f48f4 -[RCTAgora init:] + 1200
6 CoreFoundation 0x00000001beb3f660 <redacted> + 144
7 CoreFoundation 0x00000001bea1b980 <redacted> + 292
8 CoreFoundation 0x00000001bea1c564 <redacted> + 60
9 PwcApp 0x00000001048fa30c -[RCTModuleMethod invokeWithBridge:module:arguments:] + 492
10 PwcApp 0x000000010493fa60 _ZN8facebook5reactL11invokeInnerEP9RCTBridgeP13RCTModuleDatajRKN5folly7dynamicE + 248
11 PwcApp 0x000000010493f7bc ___ZN8facebook5react15RCTNativeModule6invokeEjON5folly7dynamicEi_block_invoke + 88
12 libdispatch.dylib 0x0000000106e87840 _dispatch_call_block_and_release + 24
13 libdispatch.dylib 0x0000000106e88de4 _dispatch_client_callout + 16
14 libdispatch.dylib 0x0000000106e96a94 _dispatch_main_queue_callback_4CF + 1360
15 CoreFoundation 0x00000001beac61bc <redacted> + 12
16 CoreFoundation 0x00000001beac1084 <redacted> + 1964
17 CoreFoundation 0x00000001beac05b8 CFRunLoopRunSpecific + 436
18 GraphicsServices 0x00000001c0d34584 GSEventRunModal + 100
19 UIKitCore 0x00000001eb507558 UIApplicationMain + 212
20 PwcApp 0x0000000104787240 main + 124
21 libdyld.dylib 0x00000001be580b94 <redacted> + 4
)
This error happens only on a Release build. Debug runs completely fine. From all that I could gather this far I figured that there are a couple common culprits to this. Essentially I tried to eliminate as much difference between Release and Debug as possible. What I have tried so far:
Set Strip debug symbols on copy to NO on Release (set it same as debug).
Set Dead code stripping to NO on Release (set it same as debug).
Set Build Active Architecture only to NO on Release (set it same as debug).
Set Optimization level to NONE [-O0] (set it same as debug).
None of the above seems to solve the problem. So my question mostly now is how do I proceed in terms of troubleshooting? Is there any other setting that differs between the Debug/Release build that I could try?