ConcurrentModificationException in 3.0.4

[Daniel Segall]

I'm not sure how I got this error, but here it is:

java.util.ConcurrentModificationException
at java.util.TreeMap$PrivateEntryIterator.nextEntry(Unknown Source) ~[?:1.8.0_92]
at java.util.TreeMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_92]
at java.util.TreeMap$EntryIterator.next(Unknown Source) ~[?:1.8.0_92]
at net.sf.hajdbc.invocation.InvokeOnAnyInvocationStrategy.invoke(InvokeOnAnyInvocationStrategy.java:61) ~[44659742-67af24a6:3.0.4-SNAPSHOT]
at net.sf.hajdbc.invocation.InvocationStrategies.invoke(InvocationStrategies.java:35) ~[44659742-67af24a6:3.0.4-SNAPSHOT]
at net.sf.hajdbc.sql.AbstractInvocationHandler.invokeOnProxy(AbstractInvocationHandler.java:95) ~[44659742-67af24a6:3.0.4-SNAPSHOT]
at net.sf.hajdbc.sql.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:85) ~[44659742-67af24a6:3.0.4-SNAPSHOT]
at net.sf.hajdbc.sql.ChildInvocationHandler.invoke(ChildInvocationHandler.java:44) ~[44659742-67af24a6:3.0.4-SNAPSHOT]
at com.sun.proxy.$Proxy45.getTransactionIsolation(Unknown Source) ~[?:?]
at net.sf.hajdbc.sql.AbstractStatementInvocationHandler.getInvocationStrategy(AbstractStatementInvocationHandler.java:105) ~[44659742-67af24a6:3.0.4-SNAPSHOT]
at net.sf.hajdbc.sql.AbstractStatementInvocationHandler.getInvocationStrategy(AbstractStatementInvocationHandler.java:43) ~[44659742-67af24a6:3.0.4-SNAPSHOT]
at net.sf.hajdbc.sql.AbstractInvocationHandler.invokeOnProxy(AbstractInvocationHandler.java:90) ~[44659742-67af24a6:3.0.4-SNAPSHOT]
at net.sf.hajdbc.sql.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:85) ~[44659742-67af24a6:3.0.4-SNAPSHOT]
at net.sf.hajdbc.sql.ChildInvocationHandler.invoke(ChildInvocationHandler.java:44) ~[44659742-67af24a6:3.0.4-SNAPSHOT]
at com.sun.proxy.$Proxy46.executeQuery(Unknown Source) ~[?:?]