Moving a variable in my fragment shader makes it either not work or completely crash my PC

#version 450#extension GL_ARB_separate_shader_objects : enable#extension GL_EXT_nonuniform_qualifier : requirestruct LightInfo{    vec3 Position;//Light Position in eye-coords    vec3 La;//Ambient light intensity    vec3 Ld;//Diffuse light intensity    vec3 Ls;//Specular light intensity};struct MaterialInfo{    vec3 Ka;//Ambient reflectivity    vec3 Kd;//Diffuse reflectivity    vec3 Ks;//Specular reflectivity    float Shininess;//Specular shininess factor};struct Material{    vec4 baseColorFactor;    vec4 emissiveFactor;    float metallicFactor;    float roughnessFactor;    float normalScale;    float occlusionStrength;    int colorTextureIndex;    int normalTextureIndex;    int unlitTextureIndex;    int ambientOcclusionTextureIndex;    int metallicRoughnessTextureIndex;    int isTwoSided;    int alphaMode;    float alphaCutoff;};struct MaterialBank{    Material materials[80];};struct LightData{    vec4 pos;    vec4 color;};#define MAX_CAMERAS 16struct CameraData{    vec4 pos;    mat4 mat;    mat4 view;    mat4 proj;    mat4 clip;};layout(push_constant) uniform PushConsts {    uint cameraIndex;    uint time;} pushConsts;layout(binding = 0) uniform UniformBufferCamera {    CameraData cameras[MAX_CAMERAS];    uint cameraCount;    uint cameraMax;} cam;layout(binding = 1) uniform UniformBufferLight {    LightData lights[16];    vec4 ambientColor;    int activeLights;} light;layout(set=1, binding = 0) uniform sampler2D texSampler[32];layout(set=2, binding = 0) uniform UniformBufferMat {    MaterialBank bank;} materialBanks[1];layout(location = 0) in vec4 inNormal;layout(location = 1) in vec2 inUV0;layout(location = 2) in vec2 inUV1;layout(location = 3) in vec4 inWorldPos;layout(location = 4) in flat uint materialId;layout(location = 0) out vec4 outColor;void calculateLight(int lightIndex, vec3 position, vec3 norm, out vec3 ambient, out vec3 diffuse, out vec3 spec){    LightData thisLightSource = light.lights[lightIndex];    Material thisMaterialsource = materialBanks[0].bank.materials[materialId];    LightInfo thisLight;    thisLight.Position = thisLightSource.pos.xyz;//Light Position in eye-coords    thisLight.La = light.ambientColor.rgb;//Ambient light intensity    thisLight.Ld = thisLightSource.color.rgb;//Diffuse light intensity    thisLight.Ls = thisLightSource.color.rgb;//Specular light intensity    MaterialInfo thisMaterial;    vec4 texColor = thisMaterialsource.baseColorFactor;    if (thisMaterialsource.colorTextureIndex > -1){ texColor = texture(texSampler[thisMaterialsource.colorTextureIndex], inUV0) * thisMaterialsource.baseColorFactor; }    vec4 mrSample = vec4(1);    if (thisMaterialsource.metallicRoughnessTextureIndex > -1) { mrSample = texture(texSampler[thisMaterialsource.metallicRoughnessTextureIndex], inUV0); }    float perceptualRoughness = mrSample.g * thisMaterialsource.roughnessFactor;    float metallic = mrSample.b * thisMaterialsource.metallicFactor;    thisMaterial.Ka= texColor.rgb * (metallic+perceptualRoughness)/2;//Ambient reflectivity    thisMaterial.Kd= texColor.rgb * (perceptualRoughness);//Diffuse reflectivity    thisMaterial.Ks= texColor.rgb * (metallic-perceptualRoughness);//Specular reflectivity    thisMaterial.Shininess= (metallic);//Specular shininess factor    vec3 n = normalize(norm);    vec3 s = normalize(thisLight.Position - position);    vec3 v = normalize(-position);    vec3 r = reflect(-s, n);    ambient = thisLight.La * thisMaterial.Ka;    if (thisMaterialsource.ambientOcclusionTextureIndex > -1){        float ao = texture(texSampler[thisMaterialsource.ambientOcclusionTextureIndex], inUV0).r;        ambient = ambient * ao;    }    float sDotN = max(dot(s, n), 0.0);    diffuse = thisLight.Ld * thisMaterial.Kd * sDotN;    spec = thisLight.Ls * thisMaterial.Ks * pow(max(dot(r, v), 0.0), thisMaterial.Shininess);}void main(){    vec3 ambientSum = vec3(0);    vec3 diffuseSum = vec3(0);    vec3 specSum = vec3(0);    vec3 ambient, diffuse, spec;    // (A) - doesn't work when declared/set here  <----------------------------------------    // Material thisMaterialsource = materialBanks[0].bank.materials[materialId];    if (gl_FrontFacing)    {        for (int i=0; i<light.activeLights; ++i)        {            calculateLight(i, inWorldPos.xyz, inNormal.xyz, ambient, diffuse, spec);            ambientSum += ambient;            diffuseSum += diffuse;            specSum += spec;        }    }    else    {        for (int i=0; i<light.activeLights; ++i)        {            calculateLight(i, inWorldPos.xyz, -inNormal.xyz, ambient, diffuse, spec);            ambientSum += ambient;            diffuseSum += diffuse;            specSum += spec;        }    }    ambientSum /= light.activeLights;    // (B) - works when declared/set here <----------------------------------------    Material thisMaterialsource = materialBanks[0].bank.materials[materialId];    vec4 texColor = thisMaterialsource.baseColorFactor;    if(thisMaterialsource.colorTextureIndex > -1){ texColor = texture(texSampler[thisMaterialsource.colorTextureIndex], inUV0)  * thisMaterialsource.baseColorFactor; }    vec4 emissive = thisMaterialsource.emissiveFactor;    if (thisMaterialsource.unlitTextureIndex > -1) {        emissive = texture(texSampler[thisMaterialsource.unlitTextureIndex], inUV0) * thisMaterialsource.emissiveFactor;    }    outColor = vec4(ambientSum + diffuseSum, 1) * texColor + vec4(specSum, 1) + emissive;}