In https://github.com/wildfly/wildfly/commit/38f8f5915b40d036bd0fd1a904d6a13916f3fa2c#diff-faf7ca63d4b901f1bff0697491c8f5ddL1147 you added check on if (securityRoles != null).

securityRoles is not checked few lines below your check (in different if block)
https://github.com/wildfly/wildfly/blob/master/ejb3/src/main/java/org/jboss/as/ejb3/component/EJBComponentDescription.java#L1162 (securityRoles.getSecurityRoleNamesByPrincipal ... )

I suggest to change https://github.com/wildfly/wildfly/blob/master/ejb3/src/main/java/org/jboss/as/ejb3/component/EJBComponentDescription.java#L1158 from

if (runAsPrincipal != null) {

to

if ((securityRoles != null) && (runAsPrincipal != null)) {