[keycloak-user] ZipException: Unsupported compression method

We are seeing this exception "from time to time" on the logs. Unfortunately, I don't have much information about it, as I couldn't reproduce it consistently (yet), but perhaps someone has also seen this before? We are using KC 1.8.0.CR1. http://fpaste.org/314926/45382345/ ERROR [stderr] (default task-62) java.util.zip.ZipException: Unsupported compression method ERROR [stderr] (default task-62) at java.util.zip.GZIPInputStream.readHeader(GZIPInputStream.java:169) ERROR [stderr] (default task-62) at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:79) ERROR [stderr] (default task-62) at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:91) ERROR [stderr] (default task-62) at org.keycloak.common.util.Base64.decode(Base64.java:1274) ERROR [stderr] (default task-62) at org.keycloak.common.util.Base64.decode(Base64.java:1224) ERROR [stderr] (default task-62) at org.keycloak.common.util.Base64Url.decode(Base64Url.java:35) ERROR [stderr] (default task-62) at org.keycloak.jose.jws.JWSInput.<init>(JWSInput.java:35) ERROR [stderr] (default task-62) at org.keycloak.RSATokenVerifier.toAccessToken(RSATokenVerifier.java:52) ERROR [stderr] (default task-62) at org.keycloak.RSATokenVerifier.verifyToken(RSATokenVerifier.java:22) ERROR [stderr] (default task-62) at org.keycloak.RSATokenVerifier.verifyToken(RSATokenVerifier.java:18) - Juca.