diff --git a/cas-client-core/src/main/java/org/jasig/cas/client/authentication/AuthenticationFilter.java b/cas-client-core/src/main/java/org/jasig/cas/client/authentication/AuthenticationFilter.java
index 1870788..9b546f0 100644
--- a/cas-client-core/src/main/java/org/jasig/cas/client/authentication/AuthenticationFilter.java
+++ b/cas-client-core/src/main/java/org/jasig/cas/client/authentication/AuthenticationFilter.java
@@ -95,7 +95,7 @@ public class AuthenticationFilter extends AbstractCasFilter {
             return;
         }
 
-        final String ticket = request.getParameter(getArtifactParameterName());
+        final String ticket = CommonUtils.safeGetParameter(request,getArtifactParameterName());
         final boolean wasGatewayed = this.gatewayStorage.hasGatewayedAlready(request, serviceUrl);
 
         if (CommonUtils.isNotBlank(ticket) || wasGatewayed) {
diff --git a/cas-client-core/src/main/java/org/jasig/cas/client/session/SingleSignOutFilter.java b/cas-client-core/src/main/java/org/jasig/cas/client/session/SingleSignOutFilter.java
index 951aebf..5c6cf7c 100644
--- a/cas-client-core/src/main/java/org/jasig/cas/client/session/SingleSignOutFilter.java
+++ b/cas-client-core/src/main/java/org/jasig/cas/client/session/SingleSignOutFilter.java
@@ -57,7 +57,7 @@ public final class SingleSignOutFilter extends AbstractConfigurationFilter {
         final HttpServletRequest request = (HttpServletRequest) servletRequest;
 
         if ("POST".equals(request.getMethod())) {
-            final String logoutRequest = request.getParameter("logoutRequest");
+            final String logoutRequest = CommonUtils.safeGetParameter(request, "logoutRequest");
 
             if (CommonUtils.isNotBlank(logoutRequest)) {
 
@@ -87,7 +87,7 @@ public final class SingleSignOutFilter extends AbstractConfigurationFilter {
                 }
             }
         } else {
-        	final String artifact = request.getParameter(this.artifactParameterName);
+        	final String artifact = CommonUtils.safeGetParameter(request, this.artifactParameterName);
             final HttpSession session = request.getSession();
             
             if (log.isDebugEnabled() && session != null) {
diff --git a/cas-client-core/src/main/java/org/jasig/cas/client/util/CommonUtils.java b/cas-client-core/src/main/java/org/jasig/cas/client/util/CommonUtils.java
index 1904de8..608fc24 100644
--- a/cas-client-core/src/main/java/org/jasig/cas/client/util/CommonUtils.java
+++ b/cas-client-core/src/main/java/org/jasig/cas/client/util/CommonUtils.java
@@ -11,6 +11,7 @@ import org.jasig.cas.client.proxy.ProxyGrantingTicketStorage;
 
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
+import javax.servlet.ServletRequest;
 
 import java.io.IOException;
 import java.io.UnsupportedEncodingException;
@@ -236,4 +237,15 @@ public final class CommonUtils {
         return returnValue;
     }
 
+    /**
+     * Safe method for retrieving a parameter from the request without disrupting the reader UNLESS the parameter
+     * actually exists in the query string.
+     *
+     * @param request the request to check.
+     * @param parameter the parameter to look for.
+     * @return the value of the parameter.
+     */
+    public static String safeGetParameter(final HttpServletRequest request, final String parameter) {
+        return request.getQueryString().indexOf(parameter) != -1 ? request.getParameter(parameter) : null;       
+    }
 }
diff --git a/cas-client-core/src/main/java/org/jasig/cas/client/util/DelegatingFilter.java b/cas-client-core/src/main/java/org/jasig/cas/client/util/DelegatingFilter.java
index 28eb08f..55f22e3 100644
--- a/cas-client-core/src/main/java/org/jasig/cas/client/util/DelegatingFilter.java
+++ b/cas-client-core/src/main/java/org/jasig/cas/client/util/DelegatingFilter.java
@@ -14,6 +14,7 @@ import javax.servlet.FilterConfig;
 import javax.servlet.ServletException;
 import javax.servlet.ServletRequest;
 import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
 import java.io.IOException;
 import java.util.Iterator;
 import java.util.Map;
@@ -89,8 +90,7 @@ public final class DelegatingFilter implements Filter {
                          final ServletResponse response, final FilterChain filterChain)
             throws IOException, ServletException {
 
-        final String parameter = request
-                .getParameter(this.requestParameterName);
+        final String parameter = CommonUtils.safeGetParameter((HttpServletRequest) request, this.requestParameterName);
 
         if (CommonUtils.isNotEmpty(parameter)) {
             for (final Iterator iter = this.delegators.keySet().iterator(); iter
diff --git a/cas-client-core/src/main/java/org/jasig/cas/client/validation/AbstractTicketValidationFilter.java b/cas-client-core/src/main/java/org/jasig/cas/client/validation/AbstractTicketValidationFilter.java
index b285b72..26e284b 100644
--- a/cas-client-core/src/main/java/org/jasig/cas/client/validation/AbstractTicketValidationFilter.java
+++ b/cas-client-core/src/main/java/org/jasig/cas/client/validation/AbstractTicketValidationFilter.java
@@ -121,7 +121,7 @@ public abstract class AbstractTicketValidationFilter extends AbstractCasFilter {
 
         final HttpServletRequest request = (HttpServletRequest) servletRequest;
         final HttpServletResponse response = (HttpServletResponse) servletResponse;
-        final String ticket = request.getParameter(getArtifactParameterName());
+        final String ticket = CommonUtils.safeGetParameter(request, getArtifactParameterName());
 
         if (CommonUtils.isNotBlank(ticket)) {
             if (log.isDebugEnabled()) {