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    java.util.NoSuchElementException: null
        at com.github.ompc.greys.core.util.collection.ThreadUnsafeGaStack.checkForPopOrPeek(ThreadUnsafeGaStack.java:48)
        at com.github.ompc.greys.core.util.collection.ThreadUnsafeGaStack.pop(ThreadUnsafeGaStack.java:54)
        at com.github.ompc.greys.core.util.GaStringUtils.getStack(GaStringUtils.java:341)
        at com.github.ompc.greys.core.command.TimeTunnelCommand$1$1$1.afterFinishing(TimeTunnelCommand.java:280)
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