CassandraSessionImpl creates IgniteException even if it is not needed

"flusher-5-#97" #126 prio=5 os_prio=0 tid=0x00007fc070228000 nid=0x2a68 runnable [0x00007fbff02a3000]
   java.lang.Thread.State: RUNNABLE
	at java.lang.Throwable.fillInStackTrace(Native Method)
	at java.lang.Throwable.fillInStackTrace(Throwable.java:783)
	- locked <0x000000076b2201d0> (a org.apache.ignite.IgniteException)
	at java.lang.Throwable.<init>(Throwable.java:265)
	at java.lang.Exception.<init>(Exception.java:66)
	at java.lang.RuntimeException.<init>(RuntimeException.java:62)
	at org.apache.ignite.IgniteException.<init>(IgniteException.java:44)
	at org.apache.ignite.cache.store.cassandra.session.CassandraSessionImpl.execute(CassandraSessionImpl.java:209)
	at org.apache.ignite.cache.store.cassandra.CassandraCacheStore.writeAll(CassandraCacheStore.java:354)
	at org.apache.ignite.internal.processors.cache.store.GridCacheWriteBehindStore.updateStore(GridCacheWriteBehindStore.java:814)
	at org.apache.ignite.internal.processors.cache.store.GridCacheWriteBehindStore.applyBatch(GridCacheWriteBehindStore.java:726)
	at org.apache.ignite.internal.processors.cache.store.GridCacheWriteBehindStore.access$2400(GridCacheWriteBehindStore.java:76)
	at org.apache.ignite.internal.processors.cache.store.GridCacheWriteBehindStore$Flusher.flushCacheCoalescing(GridCacheWriteBehindStore.java:1143)
	at org.apache.ignite.internal.processors.cache.store.GridCacheWriteBehindStore$Flusher.body(GridCacheWriteBehindStore.java:1016)
	at org.apache.ignite.internal.util.worker.GridWorker.run(GridWorker.java:110)
	at java.lang.Thread.run(Thread.java:748)