Version: 12.0.4
Build #: 29994
Build Date: 2012-Oct-31 05:30:19 PM

Open a FluidShell and type the below command

|| echo tariq ||

Keep the cursor at the last pipe as attached picture and try to autocomplete (hit Tab key) gives below error in View Error Log

java.lang.ClassCastException: com.aquafold.datastudio.tools.shell.bash.execution.ListExecutionNode cannot be cast to com.aquafold.datastudio.tools.shell.bash.execution.SimpleCmdExecutionNode
    at com.aquafold.datastudio.tools.shell.assist.ShellAutocomplete.newCollectCandidates(ShellAutocomplete.java:1363)
    at com.aquafold.datastudio.tools.shell.assist.ShellAutocomplete.autoComplete(ShellAutocomplete.java:95)
    at com.aquafold.datastudio.tools.shell.FluidEditor.onAutoComplete(FluidEditor.java:871)