lib/contrast/agent/assess/policy/propagator/reverse.rb in contrast-agent-4.2.0 vs lib/contrast/agent/assess/policy/propagator/reverse.rb in contrast-agent-4.3.0

@@ -11,11 +11,10 @@
           # target's preexisting tags are unaffected beyond any merging of
           # overlapping tags.
           class Reverse < Contrast::Agent::Assess::Policy::Propagator::Base
             class << self
               def propagate propagation_node, preshift, target
-                properties = Contrast::Agent::Assess::Tracker.properties(target)
-                return unless properties
+                return unless (properties = Contrast::Agent::Assess::Tracker.properties!(target))
 
                 source = find_source(propagation_node.sources[0], preshift)
                 properties.copy_from(source, target, 0, propagation_node.untags)
 
                 length = target.length