Tomcat serious ProtocolHandler in log [Lucee 4.5]

I’m finding the following in the tomcat log on startup. Can I safely ignore it, or is it something that I need to fix? Lucee 4.5 installed on Windows Server 2012 (IIS).

13-Sep-2017 18:15:35.205 SEVERE [main] org.apache.coyote.AbstractProtocol.init Failed to initialize end point associated with ProtocolHandler ["https-openssl-nio-8443"]
 java.lang.IllegalArgumentException: java.lang.NullPointerException
	at org.apache.tomcat.util.net.AbstractJsseEndpoint.createSSLContext(AbstractJsseEndpoint.java:107)
	at org.apache.tomcat.util.net.AbstractJsseEndpoint.initialiseSsl(AbstractJsseEndpoint.java:85)
	at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:225)
	at org.apache.tomcat.util.net.AbstractEndpoint.init(AbstractEndpoint.java:972)
	at org.apache.tomcat.util.net.AbstractJsseEndpoint.init(AbstractJsseEndpoint.java:237)
	at org.apache.coyote.AbstractProtocol.init(AbstractProtocol.java:558)
	at org.apache.coyote.http11.AbstractHttp11Protocol.init(AbstractHttp11Protocol.java:65)
	at org.apache.catalina.connector.Connector.initInternal(Connector.java:968)
	at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:107)
	at org.apache.catalina.core.StandardService.initInternal(StandardService.java:549)
	at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:107)
	at org.apache.catalina.core.StandardServer.initInternal(StandardServer.java:875)
	at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:107)
	at org.apache.catalina.startup.Catalina.load(Catalina.java:606)
	at org.apache.catalina.startup.Catalina.load(Catalina.java:629)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:311)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:494)
Caused by: java.lang.NullPointerException
	at java.io.FileInputStream.<init>(FileInputStream.java:130)
	at java.io.FileInputStream.<init>(FileInputStream.java:93)
	at java.io.FileReader.<init>(FileReader.java:58)
	at org.apache.tomcat.util.net.jsse.PEMFile.<init>(PEMFile.java:74)
	at org.apache.tomcat.util.net.jsse.JSSEUtil.getKeyManagers(JSSEUtil.java:193)
	at org.apache.tomcat.util.net.openssl.OpenSSLUtil.getKeyManagers(OpenSSLUtil.java:79)
	at org.apache.tomcat.util.net.AbstractJsseEndpoint.createSSLContext(AbstractJsseEndpoint.java:105)
	... 20 more